USD262892SExpiredUtility
Mathematical aid
Individually held — no corporate assignee on recordPriority: Jul 2, 1979Filed: Jul 2, 1979Granted: Feb 2, 1982
Est. expiryJul 2, 1999(expired)· nominal 20-yr term from priority
Inventors:Burton S. Heiko
51
PatentIndex Score
9
Cited by
2
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design for an educational aid called mathematical aid, as shown.
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