U.S. patent number 3,833,395 [Application Number 05/287,837] was granted by the patent office on 1974-09-03 for continuous form computer print-out document protection system.
This patent grant is currently assigned to Burroughs Corporation. Invention is credited to Earl J. Gosnell.
United States Patent |
3,833,395 |
Gosnell |
September 3, 1974 |
CONTINUOUS FORM COMPUTER PRINT-OUT DOCUMENT PROTECTION SYSTEM
Abstract
A method of safeguarding the amount and/or signature of
negotiable instruments such as a check or similar document from
fraudulent alternation or forgery by providing a pressure transfer
coating for application to the document to be protected during
amount printing and/or signing thereof comprising a pressure
sensitive tape having a release coating, a polyester or acrylic
coating including fluorescent, colorless pigment and an amorphous
silica, and a strata having a design with a brilliantly colored
daylight fluorescent ink and a waxy-type coating thereon. The
latter three strata are pressure released from the tape and
transferred to the document over the amount or signature area to be
protected, and then heated so as to cause penetration of the
wax-like layer and deeper penetration of the amount indicia into
the document fibers.
Inventors: |
Gosnell; Earl J. (Rochester,
NY) |
Assignee: |
Burroughs Corporation (Detroit,
MI)
|
Family
ID: |
23104564 |
Appl.
No.: |
05/287,837 |
Filed: |
September 11, 1972 |
Current U.S.
Class: |
156/67; 156/76;
156/234; 283/95 |
Current CPC
Class: |
G06K
19/02 (20130101); G07C 9/24 (20200101); B41M
3/144 (20130101) |
Current International
Class: |
B41M
3/14 (20060101); G06K 19/02 (20060101); G07C
9/00 (20060101); B41m 005/10 () |
Field of
Search: |
;117/1,1.5
;283/8,8A,8B,9R,9A |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Katz; Murray
Attorney, Agent or Firm: Fish; Paul W.
Claims
What is claimed is:
1. A document protection system for safeguarding negotiable
instruments of exchange against fraudulent alteration of amount
and/or signature comprising:
A document bearing indicia including an amount and signature and
instructions relating to safeguarding the amount and signature
areas, and
a plurality of pressure applicable transparent coatings overlying
said amount and signature areas,
said coatings comprising a first layer of acrylic material
containing distinctive fluorescent, colorless pigment and an
amorphous silica, a second layer providing an overall moire design
in a brilliantly colored daylight fluorescent ink and a third layer
of waxy material of the formulation: glyceryl mono-hydroxy-stearate
79.8 percent, hydrogenated castor oil 13 percent, condensation
product of aryl sulfonamide and formaldehyde 7 percent, butylated
hydroxy-anisole 0.1 percent, and butylated hydroxy-toluene 0.1
percent.
said wax-like coating being capable under applied heat of
penetrating said document causing the amount to be visible from the
reverse side of the document.
2. A document protection system for safeguarding negotiable
instruments of exchange against fraudulent alteration of amount
and/or signature comprising;
a paper document bearing indicia including an amount and signature
and instructions relating to safeguarding the amount and signature
areas and a distinctive protection pattern adjacent one edge of
said document the disruption of which signals illegal alteration of
the document, and
a plurality of protective coatings overlying, bonded to, and
impregnating the paper of the amount and signature areas,
said coatings comprising a first layer of the dried residue of
acrylic coating material of the formulation: methyl methacrylate
copolymer (40 percent dispersion in toluene) 42.48 percent, silica
pigment 3 percent, magnesium 8-hydroxiquinolate (30 percent
dispersion) fluorescent pigment 10 percent, toluene 35.62 percent,
and isopropyl alcohol 8.9 percent, a second layer of a brilliant
daylight fluorescent green ink and a third layer of a wax material
of the formulation: glyceryl mono-hydroxy-stearate 79.8 percent,
hydrogenated castor oil 13 percent, condensation product of aryl
sulfonamide and formaldehyde 7 percent, butylated hydroxy-anisole
0.1 percent and butylated hydroxy-toluene 0.1 percent.
said wax-like coating being capable upon application of heat of
penetrating said document and solubilizing the indicia coloring
matter so as to make the amount and signature visible from the
reverse side of the document.
3. A document protection system for safeguarding negotiable
instruments of exchange against fraudulent alteration of amount
and/or signature comprising:
A document bearing indicia including an amount and signature and
instructions relating to safeguarding the amount and signature
areas,
A carrier member, and
a plurality of strata bonded together on said carrier member and
capable of being released therefrom under pressure,
said strata comprising a first layer of the dried residue of
acrylic material containing a distinctive fluorescent, colorless
pigment and an amorphous silica of the formulation: methyl
methacrylate copolymer (40 percent dispersion in toluene) 42.48
percent, silica aerogel pigment 3 percent, magnesium
8-hydroxiquinolate (30 percent dispersion) fluorescent pigment 10
percent, toluene 35.62 percent and isopropyl alcohol 8.92 percent,
a second layer (moire design) of a brilliantly colored daylight
fluorescent green ink, a third layer of a wax type material of the
formulation; glyceryl mono-hydroxy-stearate 79.8 percent,
hydrogenated castor oil 13 percent, colorless aryl sulfonamide
formaldehyde resin 7 percent, butylated hydroxy-anisole 0.1 percent
and butylated hydroxy-toluene 0.1 percent.
said wax-like material being capable under applied heat of
penetrating said document to cause the amount to become visible on
the opposite side of the document.
4. A document protection system for safeguarding negotiable
instruments of exchange against fraudulent alteration of amount
and/or signature comprising;
a document bearing indicia including an amount and signature and
instructions relating to safeguarding the amount and signature
areas,
a distinctive pattern viewable when illegally disturbed overlying
said amount area,
a carrier member including a silicone release coating thereon,
and
a plurality of strata bonded to said carrier member and releasable
therefrom under pressure, and overlying said amount area,
said strata comprising a first layer of the dried residue of
acrylic material containing a distinctive fluorescent, colorless
pigment and an amorphous silica of the formulation: methyl
methacrylate copolymer (40 percent dispersion in toluene) 42.48
percent, silica aerogel pigment 3 percent, magnesium
8-hydroxiquinolate (30 percent dispersion) fluorescent pigment 10
percent, toluene 35.62 percent and isopropyl alcohol 8.92 percent,
a second layer (moire design) of a brilliantly colored daylight
fluorescent green ink, a third layer of a wax type material of the
formulation; glyceryl mono-hydroxy-stearate 79.8 percent,
hydrogenated castor oil 13 percent, colorless aryl sulfonamide
formaldehyde resin 7 percent, butylated hydroxy-anisole 0.1 percent
and butylated hydroxy-toluene 0.1 percent.
said strata adapted to be bonded to said document by the applied
pressure and by heat so as to cause the wax-like coating material
and the amount ink to penetrate said document causing the amount
area to become visible on the opposite side of the document.
5. A document protection method for safeguarding negotiable
instruments of exchange against fraudulent alteration of amount
and/or signature comprising the steps of:
providing a document with indicia including an amount and signature
and instructions relating to safeguarding the amount and signature
areas,
applying a plurality of pressure releasable strata to a carrier
member, said strata comprising a first layer of acrylic coating
material of the formulation: methyl methacrylate copolymer (40
percent dispersion in toluene) 42.48 percent, silica pigment 3
percent, magnesium 8-hydroxiquinolate (30 percent dispersion)
fluorescent pigment 10 percent, toluene 35.62 percent, and
isopropyl alcohol 8.9 percent, a second layer of a brilliant
daylight fluorescent green ink and a third layer of a wax material
of the formulation: glyceryl mono-hydroxy-stearate 79.8 percent,
hydrogenated castor oil 13 percent, condensation product of aryl
sulfonamide and formaldehyde 7 percent, butylated hydroxy-anisole
0.1 percent and butylated hydroxy-toluene 0.1 percent.
releasing said strata from said carrier under pressure effectively
bonding said strata to said document while removing said carrier
member, and
heating said strata to cause a portion thereof to penetrate said
document transparentizing the same.
6. A document protection method for safeguarding negotiable
instruments of exchange against fraudulent alteration of amount
and/or signature comprising the steps of:
providing a document with amount, signature and instruction indicia
relating to safeguarding the amount and signature areas and a
distinctive pattern viewable when said document is illegally
disturbed,
bonding a plurality of pressure releasable strata to a carrier
member, said strata comprising a first layer of acrylic material
containing distinctive fluorescent, colorless pigment and an
amorphous silica, a second layer providing an overall moire design
in a brilliantly colored daylight fluorescent ink and a third layer
of waxy material of the formulation: glyceryl mono-hydroxy-stearate
79.8 percent, hydrogenated castor oil 13 percent, condensation
product of aryl sulfonamide and formaldehyde 7 percent, butylated
hydroxy-anisole 0.1 percent and butylated hydroxy-toluene 0.1
percent,
applying pressure to said carrier member effective to bond said
strata to said document while releasing said carrier member,
and
heating said pressure bonded strata to cause a portion of the
material thereof to penetrate said document transparentizing the
same.
7. A document protection method for safeguarding negotiable
instruments of exchange against fraudulent alteration of amount
and/or signature comprising the steps of:
printing a document with indicia including a distinctive pattern
which is exposed when the document is illegally altered or defaced
and an amount and signature and instructions relating to
safeguarding the amount and signature areas,
pressure bonding a plurality of strata releasable from a carrier
member to said document, said strata comprising a first layer of
acrylic material containing a distinctive fluorescent, colorless
pigment and an amorphous silica of the formulation: methyl
methacrylate copolymer (40 percent dispersion in toluene) 42.48
percent, silica aerogel pigment 3 percent, magnesium
8-hydroxiquinolate (30 percent dispersion) fluorescent pigment 10
percent, toluene 35.62 percent, and isopropyl alcohol 8.92 percent,
a second layer (moire design) of a brilliantly colored daylight
fluorescent green ink, a third layer of a wax type material of the
formulation: glyceryl mono-hydroxy-stearate 79.8 percent,
hydrogenated castor oil 13 percent, colorless aryl sulfonomide
formaldehyde resin 7 percent, butylated hydroxy-anisole 0.1 percent
and butylated hydroxy-toluene 0.1 percent and
heating said strata to a temperature of 175.degree.F sufficient to
cause said wax-like material to penetrate said document making the
amount visible on the opposite side thereof.
Description
BACKGROUND OF THE INVENTION
Several prior art techniques generally relate to decalcomania or
like-type transfer devices and materials and are not in fact
pertinent to the subject invention but may be considered broadly
relevant insofar as they may teach the utilization of layered
transfer compositions for visual comprehension or visual acuity as
provided by fluorescence to ultraviolet light. None of these pieces
of prior art teaches the method and apparatus for protecting
negotiable documents from fraudulent alteration as described and
claimed in the present application.
SUMMARY OF THE INVENTION
The present invention relates to both a method as well as an
article of manufacture produced by the method and comprises a paper
or similar tape carrying a multilayer coating which under pressure
can be caused to transfer to the surface of a negotiable document
in the area of the amount and/or the signature. The combined effect
of each of the layers and a legend indicating that the layer has
been affixed to the document affords excellent protection against
the known methods of check fraud by means of amount alteration.
After transfer to the document, followed by the application of
heat, protection consists of an outer layer of invisible
ultraviolet fluorescent plastic, an intermediate moire pattern in
daylight fluorescent ink which is difficult to duplicate and an
impregnation of a wax-like material through the body of the
document over the amount area.
It is an important object therefore of the present invention to
provide a document protection system for negotiable instruments
such, for example, as checks, which protects against or avoids the
known methods of check fraud through mechanical erasure, chemical
bleach, alteration by solvent removal, alteration by addition
and/or alteration by cutout and substitution of whole amount
area.
Another important object of the present invention is the provision
of check fraud prevention means through relatively simple and
inexpensive mechanical steps and employing available and well-known
chemical combinations.
Still another object of this invention is the provision of a
readily, visually comprehensible indicia of attempted document
fraud, e.g., erasure, bleach, cutout, etc.
It is also an important object of the invention to provide document
protection against fraudulent alteration of instruments of
negotiation printed by the printing mechanisms of both conventional
checkwriters and high speed computer chain or drum printers.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a plan view slightly enlarged of a conventional check
with a computer printed amount thereon and the protection overlay
adhered to the amount area;
FIG. 2 is an elevational view of the check of FIG. 1;
FIG. 3 is a greatly enlarged sectional view of the protection
overlay strata of the invention;
FIG. 4 is a greatly enlarged view of the protection strata of FIG.
3 being pressure bonded to the item of FIG. 1;
FIG. 5 is a greatly enlarged view of the item of FIG. 3 after the
pressure bonding step is completed; and
FIG. 6 is an enlarged view of the reverse side of the check after
pressure bonding of the protection layers thereto.
PREFERRED EMBODIMENT OF THE INVENTION
The invention has application to any type of negotiable document
employing money amounts and/or signatures, typical of which is the
ordinary payroll check or money order on which an amount is
printed, typed or otherwise applied and which is generally
subjected to handling by members of the public in its transfer from
individual to individual and thus is subject to alteration of
amount and/or signature by one or more of the known schemes used by
check fraud artists. The invention also has application to stock
transfer certificates, bills of exchange and any paper document
which can be issued to serve in lieu of money.
Procedures and equipment currently employed to protect business
checks from amount alteration utilize checkwriters which imprint
large, distinctive, highly colored figures and other symbols on the
check. The ink is also frequently forced into and sometimes through
the paper by pinpoint type faces of serrated platens and/or type.
Such methods are effective to a degree but are individual, hand fed
operations not suitable for checks written as computer print-out or
by typewriters or accounting machines. These latter amounts are
generally printed in small, ordinary typewriter styles through a
cloth ribbon with dye based inks and are quite easily altered by
erasure or solvent extraction.
Amount alteration generally requires (1) complete or partial
removal of digits by abrasion or solvent erasure, or (2) addition
alteration, i.e., a 3 to an 8 or a 1 to a 4. Protection against
these aforementioned alterations is considered to be a primary
technical requirement.
Present day known systems of check fraud prevention also rely for
their effectiveness on chemical type overlays or some sort of
chemical material embodied in the check itself. Assuming a fair
degree of skill on the part of the check fraud artist, it has been
a relatively simple matter to alter the amount only without
disturbing the chemical composition underlying the amount so that
the effect, while the fraud might be slightly delayed, was
nevertheless to accomplish the alteration; and, what was worse, no
known relatively easy detectable means was available to make
readily, visually apparent such fraudulent alteration.
As the check fraud artists increased in capability the check fraud
prevention schemes appeared to lag in readily apparent detection
methods. With the advent of large scale data processing equipment
and high speed wide line printers, negotiable instruments of
various types were easily, quickly and efficiently printed in
staggering numbers. The general quality of the printed image on
such computer print-out documents, e.g., payroll checks, is
sufficiently degraded from that of the regular checkwriter printed
document and even from that of the standard typewriter that
alteration of amounts has become almost "fool's play" to the highly
skilled forger. The need for a relatively simple, easily useable
document protection system thus has become one of the ever pressing
needs of the day with no known overall effective protection system
available. The present check fraud prevention system avoids the
pitfalls of the known prior art systems through the medium of a
combination of elements in such manner that any disturbance or
removal of material or alteration of amount or signature becomes
readily, visually detectable.
Referring to FIG. 1 of the drawings there is shown a document 10,
which, for purposes of the description, is illustrated as a check
and bears all of commonplace, standard, printed indicia carried by
the ordinary negotiable check. In addition to the foregoing, there
is shown in the embodiment set forth in FIG. 1, an overlay 12
which, as hereinafter described in detail, is placed on the body of
the check in the area including that part thereof bearing the
designation "amount of check" which in this case is $1,234,56.
In addition to the overlay 12, it is noted that the bottom edge of
the check, i.e., the portion below the amount and directly below
the magnetic encoded figures 14, e.g., MICR, is printed with a
daylight fluorescent, solvent insoluble, and camouflaging moire
pattern 16 identical in appearance to the pattern of the overlay
12, but which in addition bears the warning "check void if this
Green-Glo design is missing or defaced over amount." The moire 16
is ink printed on the material of the check with the warning
overprinted on the moire pattern. The reason for this particular
arrangement will become more clear as the description proceeds.
It is contemplated that the check fraud prevention system of the
subject invention can be used with high speed printers of the type
generally employed with electronic data processing equipment, and
therefore an important aspect of this description relates to such
use. Since, as earlier mentioned herein the printed image from the
computer print-out is relatively crude by comparison with general
printing as is standard in the check and document printing
industry, alteration of such printing is relatively simple. To
avoid such document fraud and to enhance detection of attempts
thereat, the present system has been devised. The invention as
illustrated in FIG. 3 comprises four different strata overlaid one
on top of the other on a carrier member such, for example, as a
release paper tape 18. In the present embodiment the tape 18 is a
two side coated silicone, Quillon, Aquapel, etc. paper. The Quillon
paper may be obtained from the St. Regis Paper Company, Rhinelander
Division, Rhinelander, Wis. as Quillon Q202 Paper, or paper may be
coated with Aquapel manufactured by Hercules Incorporated,
Wilmington, Delaware, or paper may be coated with silicone resin
obtained from Dow Corning, Midland; Mich. The coating 20 is
formulated to provide a quick release of the other adjacent layers
from the tape 18.
Arbitrarily, for purposes of description only, layer one is
designated a release coating 20, e.g., silicone resin. Layer two is
designated a polyester or acrylic coating 22 containing a
distinctive fluorescent, colorless pigment and an amorphous silica.
A formulation for coating 22 is as follows:
Wet Dry Coated ______________________________________ 1. Elvacite
6014 (40% dispersion) 42.48% 18.90% 2. Santocel 68 (silica pigment)
3.00 3.00 3. Magnesium 8-Hydroxiquinolate (30% dispersion)
fluorescent pigment 10.00 3.00 4. Toluene 35.62 5. Isopropyl
Alcohol 8.90 100.00 24.90
______________________________________
Layer three is designated an overall moire design 24 printed with a
brilliantly colored daylight fluorescent ink made from pigments of
the type Signal Green Extra No. 77-18X produced by the Radiant
Color Division, Imperial Color and Chemical Department, Hercules
Incorporated the appearance of which is impossible to duplicate
with ordinary, standard inks (this design will also fluoresce under
ultraviolet light). Layer four is designated a waxy-type coating
26. Since ordinary waxes are ineffective for the purpose, a special
check protection wax is formulated as follows:
1. Paricin 13 (Glyceryl Mono-Hydroxy-Stearate) 79.8% 2. Castorwax
MP 70 (Hydrogenated Castor Oil--Baker Castor Oil Company, Bayonne,
New Jersey) 13.0 3. Santolite "MHP" (Condensation product of Aryl
Sulfonamides and Formaldehydes--Monsanto Company, St. Louis,
Missouri 7.0 4. Tenox BHA (Butylated Hydroxy-anisole) 0.1 5. Tenox
BHT (Butylated Hydroxy-toluene) 0.1 100.0
The mixture forming the waxy coating 26 must have a proper melting
point to prevent blocking when in rolled tape form at temperatures
up to 130.degree. F. It must have sufficient adhesion to th
overlying fluorescent coating to prevent flaking or premature
release from the substrate at low storage and shipping
temperatures. It must also have sufficiently low cohesion to permit
a clean edged break or transfer under pressure from tape to
document.
It must be excellent dye solvent and tend to repel pen and pencil
writing. It must also be a paper transparentizer when melted on the
document sheet. Finally it must be stable to aging, non-toxic and
harmless to the paper at high temperatures. The total tape
thickness is approximately 2.5 mils.
The application of the protection layers to a document utilizes a
cold, flat platen or roller 28 to provide sufficient pressure to
cause layers two, three, and four to transfer to the document over
the amount area while releasing from the paper tape 18. The tape 18
may be in the form of a roll which can be fed to the press area and
under the roller 28 by means not shown. Thus, as seen in FIG. 4, as
applied to the document to be protected, the top layer on the
document is a colorless, fluorescent coating 22 approximately 0.2
mils in thickness, while the second layer is a complex color design
24 and the layer 26 directly over the amount on the document is a
special "wax" coating 28 0.8 to 1.0 mil thick. Subsequent heating
of the document to the melting point of the "wax" (about
175.degree. F) carries the waxy material into and through the body
of the document 10 as shown in FIGS. 5 and 6, while at the same
time causing deeper penetration of the amount characters into the
document fibers by virtue of the waxy composition's strong solvency
for the character dyes and its transparentizing of the check paper
so they can be viewed in reverse from the opposite side of the
document.
It appears that penetration of the amount ink is deepest with cloth
ribbon inks and is least with plastic based, film ribbon inks. It
is apparent that both transfer and penetration steps may be made at
one time if heated platens are used. Experimentation has determined
that the foregoing system, if taken full advantage of, offers
excellent protection against mechanical erasure. For example, a
black spot or smudge 30, FIG. 1, is observed under ultraviolet when
the fluorescent overcoating and the "Day Glo" design are removed
(ordinary inks do not glow under invisible light). Also, removal of
the moire pattern exposes the word "void" printed as a repeating
pattern on the check in the amount area.
In practice, computer amount print-outs on continuous form
documents, e.g., checks, would be automatically protected through
transfer of the multilayer coating from the tape to the amount area
at computer print-out speeds. The combined effect of each of the
three layers in conjunction with a printed legend affords excellent
protection against the known methods of check fraud by means of
amount alteration.
After transfer to the check, protection consists of an outer layer
of invisible ultraviolet fluorescent plastic, an intermediate,
moire pattern in daylight fluorescent green in which is designed to
completely mask from view the void pattern as at 14 in FIG. 1, and
an impregnation of a wax-like material through the body of the
check over the amount area. As before mentioned, an instruction to
the cashier is printed on the check to complete the protection
system.
The advantages of the present invention are manifold and include
the following: Dye based ribbon inks are caused to penetrate
completely through the body of the check along with the wax layer
so that the paper surface becomes badly scuffed or the paper
destroyed before the character can be removed. Even highly abrasive
erasers tend to slip on the waxy surface and produce visible
smudges over the area of attempted alteration. Penetration of the
ribbon ink permits easy reverse readability of the original amount
from the back side of the check so that confirmation of the face
amount may be made, i.e., addition of or to a figure, or erasure
and re-entry are obvious by comparing face and back.
The wax layer overlaying and permeating the amount area affords
complete protection against removal of one or more digits by oxygen
bleaches and alkaline or acid chlorine eradicators.
The green fluorescent pattern is a close, very fine line, moire
design printed with a special green ink which glows under ordinary
light, giving it a brilliant effect. This intermediate layer of the
composite transfer coating also fluoresces strongly under
ultraviolet light. Any attempt to erase an amount digit immediately
removes this design and the top fluorescent plastic layer.
Restoration is very difficult, first because of the fineness and
intricacy of the pattern but primarily because no readily available
writing or printing ink can be made to match the Day-Glo effect of
the special ink. Erasure is obvious both in daylight and under
ultraviolet: The effectivenss of this feature is enhanced by the
presence of the legend 16 at the bottom edge of the document.
The moire pattern is unaffected visibly by oxygen bleaches or acid
and alkaline chlorine bleaches.
Application of any solvent to the amount imprint ink will
immediately remove this distinctive design. If a partial removal is
attempted, tampering is visually obvious under both ordinary and
ultraviolet lights.
The addition of one or more amount digits or the pen or typewriter
addition-alteration of any one digit is prevented by the presence
of the wax layer and evidenced by visual confirmation with the
correct amount as seen on the reverse side of the check.
In combination with the legend 16 excellent protection is afforded
against this form of check fraud. Since the daylight fluorescent
pattern is printed over the amount area as a synchronized function
of the check writing operation, and only in conjunction with this
operation, stolen blank checks or even cancelled checks could no
longer be a "cut-out" source.
The fluorescent top layer 22 of the transfer tape is very thin
(about 0.000015 inch) but tough. It is brilliantly fluorescent
under ultraviolet light, permits the printing of the Day-Glo
pattern on an otherwise unprintable surface, protects the pattern
from scuffing, but is easily removed by mechanical scraping or
abrasive erasure to show a black spot in an otherwise brightly
fluorescent area under ultraviolet light observation.
Bleaches have no visible effect on this protective layer--it does,
however, act as a barrier in bolstering the wax to prevent bleaches
from contacting the amount area.
Application of any ink solvent removes this coating. Under
ultraviolet the solvent treated area shows up as a black spot in a
bright yellow area.
The legend referred to here consists of an instruction such as
"Check Void If This GREEN-GLO Pattern Missing or Defaced Over
Amount Area." The legend is printed over a three-sixteenths inch
lithographed band (suggested location bottom of check) and is a
replica of the green daylight fluorescent pattern. Since the
legend--both words and pattern--will be printed with inks made from
polymerizable drying varnishes, it cannot be removed by solvents or
bleaches, and mechanical erasure of the entire band results in an
obviously tampered-with document. The legend therefore serves to
alert the cashier to any of the above forms of amount
alteration.
Since, as earlier pointed out herein, it is desirable to employ the
system with electronic data processing equipment, a speed of
handling of 10 3 1/2 inch documents per second or a web speed of
175 feet per minute may be used as a requirement criteria. It has
also been determined experimentally that with suitable and proper
impression pressure, transfer from the tape can be made in
one-twentieth of a second.
There has thus been described a novel and heretofore unknown
document protection system wherein a low coefficient of friction,
solvent resistant coating on a release substrate tape is pressure
releasable and bondable to the surface of a document and upon the
application of suitable heat can be caused to permanently penetrate
the body of the document. The transferred coating penetrates the
document from front to back carrying with it the dye based ribbon
ink and thereby permanently dyeing the paper fibers beneath as well
as on the surface.
* * * * *