USD351858SExpiredUtility
Ruler teaching apparatus
Individually held — no corporate assignee on recordPriority: Mar 3, 1993Filed: Mar 3, 1993Granted: Oct 25, 1994
Est. expiryMar 3, 2013(expired)· nominal 20-yr term from priority
Inventors:John Jones
29
PatentIndex Score
2
Cited by
20
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design of a ruler teaching apparatus, as shown and described.
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