USD272366SExpiredUtility

Electronic teaching aid

64
Individually held — no corporate assignee on recordPriority: Dec 14, 1981Filed: Dec 14, 1981Granted: Jan 24, 1984
Est. expiryDec 14, 2001(expired)· nominal 20-yr term from priority
Inventors:Lawrence J. GreenbergGregory E. Hyman
64
PatentIndex Score
9
Cited by
3
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for electronic teaching aid, as shown and described.

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