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Patent
   D392200
Priority
Sep 18 1995
Filed
Mar 05 1996
Issued
Mar 17 1998
Expiry
Mar 17 2012
Inventors
Gibson, Ja…
Assg.orig
Invicta Pl…
Assg.curr
Invicta Pl…
Entity
unknown
Referenced by
4
References
2
Maint.:
n/a
The ornamental design for a mathematical balance, shown and described.

FIG. 1 is a perspective view of the mathematical balance with two weights;

FIG. 2 is a perspective view of part of the mathematical balance;

FIG. 3 is an exploded perspective view of an arm of the mathematical balance; and,

FIG. 4 is an exploded perspective view of the base and central support of the mathematical balance.
INVENTORS:

Gibson, James Dorian, Thompson, Stephen Reginald

THIS PATENT IS REFERENCED BY THESE PATENTS:
Patent Priority Assignee Title
11295633, Apr 16 2018 THE PROPHET CORPORATION Lever system as a teaching tool
9466227, Oct 15 2012 Multiple mathematical operation teaching device
D611375, Sep 11 2009 Youth Toy Enterprise Co., Ltd. Balance for teaching
D843481, Oct 30 2015 Viggi Corporation Balance for an educational set of children's dice blocks
THIS PATENT REFERENCES THESE PATENTS:
Patent Priority Assignee Title
3486244,
4731022, Aug 18 1986 Teaching arithmetic principles
ASSIGNMENT RECORDS    Assignment records on the USPTO
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Executed onAssignorAssigneeConveyanceFrameReelDoc
Feb 15 1996GIBSON, JAMES DORIANInvicta Plastics LimitedASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0079380287 pdf
Feb 15 1996THOMPSON, STEPHEN REGINALDInvicta Plastics LimitedASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0079380287 pdf
Mar 05 1996Invicta Plastics Limited(assignment on the face of the patent)
MAINTENANCE FEES AND DATES:    Maintenance records on the USPTO
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