USD333319SExpiredUtility

Teaching aid for children learning algebraic numbers

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Individually held — no corporate assignee on recordPriority: Apr 3, 1991Filed: Apr 3, 1991Granted: Feb 16, 1993
Est. expiryApr 3, 2011(expired)· nominal 20-yr term from priority
Inventors:Faa C. Hwang
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PatentIndex Score
1
Cited by
4
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a teaching aid for children learning algebraic numbers, as shown and described.

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