U.S. patent number D252,758 [Application Number 05/793,162] was granted by the patent office on 1979-08-28 for portable teaching aid.
Invention is credited to Lester E. Prall.
United States Patent |
D252,758 |
Prall |
August 28, 1979 |
Portable teaching aid
Claims
The ornamental design for a portable teaching aid, substantially as
shown.
Inventors: |
Prall; Lester E. (Salt Lake
City, UT) |
Appl.
No.: |
05/793,162 |
Filed: |
May 2, 1977 |
Current U.S.
Class: |
D19/62;
D19/114 |
Current International
Class: |
D1907 |
Field of
Search: |
;D19/59,62,52
;35/60,64,61 ;D34/15LL,15R ;46/13 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
60727 |
|
Mar 1943 |
|
DK |
|
458623 |
|
Jul 1950 |
|
IT |
|
Primary Examiner: Feifer; Melvin B.
Attorney, Agent or Firm: Moore; W. Britton
Description
FIG. 1 is a front perspective view of a portable teaching aid
showing my new design in operating open or expanded position;
FIG. 2 is a side elevation view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a view in elevation of the opposite side of FIG. 1;
and
FIG. 5 is a perspective view of the teaching aid in closed
position.
* * * * *