USD333818SExpiredUtility
Track ball
Individually held — no corporate assignee on recordPriority: Aug 2, 1991Filed: Aug 2, 1991Granted: Mar 9, 1993
Est. expiryAug 2, 2011(expired)· nominal 20-yr term from priority
Inventors:Tso S. Yang
58
PatentIndex Score
9
Cited by
6
References
1
Claims
Claims
exact text as granted — not AI-modifiedThe ornamental design for a track ball, as shown and described.
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