USD306611SExpiredUtility

Teaching clock

37
Assignee: EDUCATIONAL INSIGHTS INCPriority: Dec 11, 1986Filed: Dec 11, 1986Granted: Mar 13, 1990
Est. expiryDec 11, 2006(expired)· nominal 20-yr term from priority
Inventors:Brian HillsDennis J. GrahamBurton Cutler
37
PatentIndex Score
3
Cited by
6
References
1
Claims

Claims

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

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