Patent
   D322812
Priority
Nov 13 1989
Filed
Nov 13 1989
Issued
Dec 31 1991
Expiry
Dec 31 2005
Assg.orig
Entity
unknown
3
5
n/a
The ornamental design for a mathematical educational device, as shown and described.

FIG. 1 is a perspective view of the mathematical educational device showing my new design, and having the lid to a storage compartment associated therewith shown in a semi-open position;

FIG. 2 is a rear elevational view thereof with the lid shown in the semi-open position;

FIG. 3 is a top plan view thereof with the lid shown in the closed position;

FIG. 4 is a right side elevational view thereof with the lid shown in the semi-open position with it being understood that the left side elevational view will be a mirror image thereof, and;

FIG. 5 is a front elevational view thereof with the lid shown in the semi-open position.

Harwin, Joan D.

Patent Priority Assignee Title
D359274, Dec 01 1993 Minnesota Mining and Manufacturing Company Combined card reader and case
D378969, Nov 13 1995 EVENFLO COMPANY, INC Infant activity quilt
D656133, May 06 2010 Motorola Mobility LLC Audio interface
Patent Priority Assignee Title
D256028, May 01 1978 Texas Instruments Incorporated Case for an electronic learning aid, game or similar apparatus
D269356, Mar 20 1981 Canon Kabushiki Kaisha Desk top electronic calculator
D283403, Oct 17 1983 Integrated Display Technology Limited Electronic timer
D290815, Mar 18 1985 FIRST NATIONAL BANK OF CHICAGO, THE Timer
D310094, May 19 1987 Aurora Impex Corporation Electronic calculator
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Nov 08 1989HARWIN, JOAN D HARWIN, ALEC S AND HARWIN, TAYLOR M ASSIGNMENT OF ASSIGNORS INTEREST 0057190001 pdf
Nov 13 1989Alec S., Harwin(assignment on the face of the patent)
Nov 13 1989Taylor M., Harwin(assignment on the face of the patent)
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