USD403335SExpiredUtility

Four blade drill bit

41
Assignee: DRESSER INDPriority: Dec 1, 1997Filed: Dec 1, 1997Granted: Dec 29, 1998
Est. expiryDec 1, 2017(expired)· nominal 20-yr term from priority
Inventors:Robert W. ArfeleGeorge A. EspirituEd Martin
41
PatentIndex Score
4
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37
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a four blade drill bit, as shown and described.

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