USD621877SActiveUtility

Math teaching aid

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Assignee: WILLIAMS MICHAEL DEANPriority: Mar 17, 2008Filed: Mar 17, 2008Granted: Aug 17, 2010
Est. expiryMar 17, 2028(~1.6 yrs left)· nominal 20-yr term from priority
Inventors:Michael D. Williams
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PatentIndex Score
3
Cited by
3
References
1
Claims

Claims

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

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