USD258499SExpiredUtility

Mine roof warning indicator

42
Individually held — no corporate assignee on recordPriority: Dec 21, 1978Filed: Dec 21, 1978Granted: Mar 10, 1981
Est. expiryDec 21, 1998(expired)· nominal 20-yr term from priority
Inventors:Larry L. BrownRobert G. Hamm
42
PatentIndex Score
3
Cited by
4
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a mine roof warning indicator, as shown.

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