USD322812SExpiredUtility

Mathematical educational device

20
Individually held — no corporate assignee on recordPriority: Nov 13, 1989Filed: Nov 13, 1989Granted: Dec 31, 1991
Est. expiryNov 13, 2009(expired)· nominal 20-yr term from priority
Inventors:Joan D. Harwin
20
PatentIndex Score
3
Cited by
5
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a mathematical educational device, as shown and described.

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