PTO Wrapper PDF
Dossier Espace Google
Patent
   D243847
Priority
Oct 15 1974
Filed
Oct 15 1974
Issued
Mar 29 1977
Expiry
Mar 29 1991
Inventors
Holcomb, J…
Assg.orig
Assg.curr
Entity
unknown
Referenced by
1
References
3
Maint.:
n/a
The ornamental design for a battery comparator educational board, as shown.

FIG. 1 is a front perspective view of a battery comparator educational board showing my new design;

FIG. 2 is a left front perspective view thereof shown on a reduced scale; and,

FIG. 3 is a rear perspective view thereof.
INVENTORS:

Holcomb, Jack N.

THIS PATENT IS REFERENCED BY THESE PATENTS:
Patent Priority Assignee Title
D898825, Apr 30 2019 Research Foundation of City University of New York Electron house teaching aid
THIS PATENT REFERENCES THESE PATENTS:
Patent Priority Assignee Title
2374800,
2826628,
3295226,
ASSIGNMENT RECORDS    Assignment records on the USPTO
Executed onAssignorAssigneeConveyanceFrameReelDoc
MAINTENANCE FEES AND DATES:    Maintenance records on the USPTO
n/a
Date Maintenance Fee Events


n/a
Date Maintenance Schedule