U.S. patent application number 11/561228 was filed with the patent office on 2008-05-22 for drinking straw.
Invention is credited to Daniel Frederick Nesbitt, Teruko Inomata Nesbitt.
Application Number | 20080116292 11/561228 |
Document ID | / |
Family ID | 39415950 |
Filed Date | 2008-05-22 |
United States Patent
Application |
20080116292 |
Kind Code |
A1 |
Nesbitt; Teruko Inomata ; et
al. |
May 22, 2008 |
Drinking Straw
Abstract
A drinking straw having a tubular member made of a plastic,
having an interior passage that provides fluid communication
between an inlet end for immersing into a beverage and a draw end
for placing between the lips of a user; and a multipore member,
disposed within the tubular member along a portion of the length of
the tubular member, having a plurality of passageways extending
from an inlet end to the draw end of the multipore member. The
multipore member is typically plastic and formed of a plurality of
individual flow tubes that communicate between the inlet end and
draw end of the multipore member.
Inventors: |
Nesbitt; Teruko Inomata;
(Cincinnati, OH) ; Nesbitt; Daniel Frederick;
(Cincinnati, OH) |
Correspondence
Address: |
HASSE & NESBITT LLC
8837 CHAPEL SQUARE DRIVE, SUITE C
CINCINNATI
OH
45249
US
|
Family ID: |
39415950 |
Appl. No.: |
11/561228 |
Filed: |
November 17, 2006 |
Current U.S.
Class: |
239/33 |
Current CPC
Class: |
A47G 21/187
20130101 |
Class at
Publication: |
239/33 |
International
Class: |
A47G 21/18 20060101
A47G021/18 |
Claims
1. A drinking straw consisting of: a tubular member made of a
plastic, having an interior passage that provides fluid
communication between an inlet end for immersing into a beverage
and a draw end for placing between the lips of a user; and a
plastic multipore member, disposed within and across the entire
interior cross section of the interior passage tubular member along
a portion of the length of the tubular member, having a plurality
of passageways through which the beverage flows, extending from the
inlet end to the draw end of the multipore member.
2. (canceled)
3. The drinking straw of claim 2 wherein the multipore member
comprises a plurality of individual flow tubes that communicate
between the inlet end and draw end of the multipore member.
4. The drinking straw of claim 6 wherein the multipore member
comprises a microporous structure that communicates between the
inlet end and draw end of the multipore member.
5. The drinking straw of claim 1 wherein the multipore member is in
cylindrical form, to be inserted within the passage of the tubular
straw member.
6. The drinking straw of claim 1 wherein the multipore member is
formed integrally with the tubular member.
7. The drinking straw of claim 1 wherein the multipore member
further comprises a non-porous portion disposed within the cross
section of the tubular member.
8. The drinking straw of claim 7 wherein the multipore member
comprises a plurality of individual flow tubes that communicate
between the inlet end and draw end of the multipore member.
9. The drinking straw of claim 1 wherein the multipore member
comprises a microporous plastic structure that communicates between
the inlet end and draw end of the multipore member.
10. The drinking straw of claim 3 wherein the multipore member
comprises at least three passageways.
11. The drinking straw of claim 8 wherein the multipore member
comprises at least three passageways.
12. The drinking straw of claim 10 wherein the multipore member
comprises at least ten passageways.
13. The drinking straw of claim 1 wherein the multipore member
comprises at least ten passageways.
14. The drinking straw of claim 1 wherein the multipore member
comprises a plurality of confronting, closely-spaced plates.
15. (canceled)
16. (canceled)
17. The drinking straw of claim 1 wherein the tubular member has an
outer surface that is cylindrical.
18. The drinking straw of claim 17, wherein the effective diameter
of the plurality of passageways is less than 25% the diameter of
the tubular member.
19. The drinking straw of claim 18, wherein the effective diameter
of the plurality of passageways is less than 10% the diameter of
the tubular member.
20. (canceled)
21. The drinking straw of claim 4, wherein the effective diameter
of the plurality of passageways is less than 25% the diameter of
the tubular member.
22. The drinking straw of claim 21, wherein the effective diameter
of the plurality of passageways is less than 10% the diameter of
the tubular member.
Description
FIELD OF THE INVENTION
[0001] The invention is in the field of drinking straws,
specifically for hot or cold beverages.
BACKGROUND
[0002] Hot beverages are commonly consumed by people and include
tea, hot chocolate and coffee drinks. While warm beverages can be
drunk without problem, hot beverages can scald and burn the mouth
and lips. Nevertheless, the advantages of producing and dispensing
hot beverages in containers permits dispensing the beverage after
preparing it, without waiting for it to cool or cooling it, and
extends the temperature of the beverage for a longer period of
time. Another problem with hot beverages is the potential for
tipping and spilling of the beverage, which can burn or scald the
skin of the user.
[0003] To prevent or limit the chance of spillage of the hot
beverage, the container can be fitted with a lid that contains the
beverage. The lid typically has an opening, typically a reclosable
opening, through which the beverage can be sipped. Nevertheless,
the hot beverage can still scald and burn the mouth and lips.
[0004] Similarly, very cold beverages that are drunk at the low
temperatures or at high draw volumes can overly chill the mouth,
and sometimes can cause a "brain freeze" headache.
SUMMARY OF THE INVENTION
[0005] The present invention relates to a drinking straw
comprising: a tubular member made of a plastic, having an interior
passage that provides fluid communication between an inlet end for
immersing into a beverage and a draw end for placing between the
lips of a user; and a multipore member, disposed within the tubular
member along a portion of the length of the tubular member, having
a plurality of passageways extending from an inlet end to the draw
end of the multipore member.
[0006] The present invention further provides a drinking straw
having a tubular shape that has a greater pressure drop of the
liquid beverage for a given beverage flow rate, or conversely, a
reduced beverage flow rate through the drinking straw for a given
pressure drop, relative to a conventional drinking straw of the
same tubular size. This can prevent the person drinking through the
straw from drawing in excessive amounts of the high-temperature, or
cold-temperature, beverage, into the mouth.
[0007] The invention also provides a drinking straw comprising a
tubular member having an internal diameter, and a multipore member
that has a substantially greater liquid passage surface area
through its cross section, relative to the tubular member, that
provides a greater heat transfer area with the beverage liquid as
it passes through the passageways of the multipore member.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 shows an embodiment of the drinking straw of the
present invention with a portion of the tubular member cut away and
having plurality of individual flow tubes.
[0009] FIG. 2 shows a second embodiment of the drinking straw of
the present invention with a portion of the tubular member cut
away, and having plurality of individual flow tubes and a
non-porous portion disposed within a cross section of the tubular
member.
[0010] FIG. 3 shows another embodiment of the drinking straw of the
present invention with a portion of the tubular member cut away and
having a microporous multipore member.
[0011] FIG. 4 shows another embodiment of the drinking straw of the
present invention with a portion of the tubular member cut away and
having a multipore member having a plurality of confronting,
closely-spaced plates.
DETAILED DESCRIPTION OF THE INVENTION
[0012] The present invention provides a drinking straw for drinking
hot and cold beverages. The straw has an outer tubular surface,
which typically resembles a conventional cylindrical drinking
straw, and a corresponding inner tubular surface. The inner straw
has an passage defined by the inner tubular surface has an
obstructed portion that obstructs the flow of the beverage that is
being drawn through the straw.
[0013] The obstructed portion provides a means for reducing the
cross sectional area for flow of the beverage. Reduction of the
total cross section area results in a lower flow rate of beverage
drawn through the obstructed portion and the drinking straw, as
compared to a conventional straw having the same inner tubular
surface size when drawing with the same drawing (sucking)
pressure.
[0014] The obstructed portion also provides a means for reducing
the effective diameter or cross sectional area of each of the
plurality of passageways formed in or by the obstructed portion.
The effective diameter of the passageway is the size of the largest
sphere within the passageway. A plurality of passageways with
reduced effective diameters or cross sectional area, in total, will
more greatly reduce or obstruct the flow of beverage at a given
drawing pressure compared to a single passageway having the same
total cross sectional area. The plurality of reduced-area
passageways require an increased pressure differential for a given
flow rate. This means that the user must draw the beverage up the
straw with greater drawing pressure in order to achieve the same
flow rate of beverage as compared to a conventional straw of the
same outer tube size. The effective diameter of the passageway is
typically about 25% or less of the diameter of the straw, more
typically less than 15%, and even more typically less than 10%.
Typically the user must draw with at least 50% more pressure
(vacuum) than with only a conventional straw, for a given flow
rate, more typically at least 100% more pressure, and more
typically at least 300% more pressure.
[0015] Further, the obstruction provides a means for moving heat
from, or moving heat to, the beverage, from the material from which
the obstructed portion is made. In effect, the obstruction can
serve as a heat sink. Hot beverages being drawn through the
obstruction will transfer heat into the obstructed portion.
Conversely, cold beverages being drawn through the obstructed
portion will draw heat from the obstructed portion. This amount of
heat transferred is proportional to the surface area of the
plurality of passageways in the obstruction. The amount of heat
withdrawn from the beverage as it passes through the straw will
depend on several factors, including, but not limited to, the
amount of surface area within the passageways, the flow rate, the
inlet temperature of the beverage, the heat transfer coefficient of
the straw material. Typically the temperature drops at least
1.degree. C., more typically about 2-5.degree. C.
[0016] A benefit of the invention is that a person drinking hot
beverages, such as store-bought coffee, hot chocolate, and tea,
will less likely draw too much hot beverage, too quickly, into the
mouth. The drinking straw of the present invention can serve to
restrict the rate of flow of the beverage through the straw, or
withdraw heat out of the beverage and into the obstruction
(consequently, reducing the temperature of the beverage that enters
the mouth), or both.
[0017] The obstructed portion typically comprises a multipore
member which is formed within the inner tubular passage of the
outer tubular member. The multipore member can be integrally formed
with the tubular member, or can be a discrete element that is
inserted and secured therein. The multipore member has a plurality
of pores or passageways, much like capillaries, that communicate
across the multipore member from an inlet end to an outlet or draw
end. Each pore or capillary can be a discrete passageway along the
length from the inlet end to the outlet end, or it can intersect
with, join, and split off from other passageways along the length.
The pore or capillary can have any shape, such as circular,
elliptical, oval, rectalinear, and irregular, and can have a
different cross sectional shape at various positions along the
length of the straw.
[0018] The multipore member can be configured to extend any portion
of the length along the inner surface of the tubular member.
Multiple multipore members can be formed into one straw along its
length. The multipore member can be configured to extend across the
entire interior cross section of the tubular member. The multipore
member can also be configured to extend across one portion, or
across several portions, of the cross section of the tubular
member. Typically, the remaining portions are closed off with a
wall or other non-porous, non-fluid communicating, member.
[0019] One embodiment of the drinking straw and multipore member is
shown in FIG. 1, showing the drinking straw 10 having an outer
tubular member 12 and a multipore member 20. The tubular member 12
resembles a conventional drinking straw, having an inner surface
14, a draw end 16 and an inlet end 18. The multipore member 20 is
shown disposed intermediate the draw end 16 and the inlet end 18 of
the tubular member 12, but can be positioned proximate either end.
The multipore member 20 is shown as a plurality of elongated
tubules 22, each individually having an inlet end 24 and a draw or
outlet end 26 oriented toward the inlet end 18 and draw end 16 of
the tubular member 12, respectively, and which define a small
diameter capillary or passageway 32. The typical internal passage
defined by the inner surface 14 is about 3-7 mm in diameter, and
the typical passageway 32 is about 0.1 to 1 mm in effective
diameter. The plurality of tubules 22 are typically bundled to
prevent relative movement, and are typically fixed in position
along the length of the tubular member 12. Alternatively, the
plurality of tubules 22 can be formed integrally, such as by
extrusion of the plastic material. While FIG. 1 shows approximately
25 individual tubules, the number of tubules and their capillaries
can vary depending upon the thickness of the tubule wall 30 of each
tubule and between tubules, the effective diameter of the tubules,
the length of the tubules, as well as the desired reduction in the
amount of liquid flow for a given drawing pressure (vacuum).
[0020] Another embodiment of the drinking straw and multipore
member is shown in FIG. 2. This drinking straw 110 resembles the
one shown in FIG. 1, but provides that a portion of the cross
section of the tubular member 12 is occupied by at least one
non-porous member 40. The non-porous member 40 can be a solid
member, or can be hollow. The non-porous member 40 can extend the
length of the tubules 22, or can be substantially planar, adjacent
one end 26, or the other end 24, or anywhere along the length of,
tubules 22. FIG. 2 shows a single non-porous member 40 disposed
inside or a ring of tubules 22. There can also be a plurality of
the non-porous members, and the non-porous member can be disposed
around a central bundle of tubules 22. Essentially any sort of
arrangement of the non-porous member 40 with the tubules 22 can be
made, including randomly and in a pattern.
[0021] A further embodiment of the drinking straw and multipore
member is shown in FIG. 3. The drinking straw 210 has a multipore
member made from a microporous structure. The microporous structure
typically has randomly arranged capillaries that split and join
with other numerous other capillaries, passing from one end of the
microporous structure to the other. A typical example of the
microporous structure can be found the sintered microporous plastic
disclosed in U.S. Pat. No. 6,030,558, the disclosure of which is
incorporated herein by reference.
[0022] Another drinking straw and multipore member is shown in FIG.
4. The drinking straw 310 has a multipore member 320 comprising a
plurality of confronting, closely-spaced plates 60. The confronting
plates 60 can be joined intermittently along their widths at joints
62. The gap 64 between confronting plates is typically between 0.05
to 0.5 mm.
[0023] The obstruction or micropore member, can be made of any
suitable material, including plastic, ceramic, and metal. Typical
plastic materials include polyethylene terephthalate (PET), (high
density) polyethylene, polypropylene, and polycarbonate. The
plastic can be the same type as used in making the outer tubular
member, or different. The plastic used to form the obstruction is
preferably flexible and non-friable to avoid breakage and
splintering. Preferred for hot beverages is a plastic that designed
for use with hot to boiling temperatures, to minimize softening of
the plastic and possible extraction of compounds within the plastic
into the hot beverage. Other materials include metal materials,
typically aluminum.
* * * * *