USD404044SExpiredUtility

Six blade drill bit

59
Assignee: DRESSER INDPriority: Dec 1, 1997Filed: Dec 1, 1997Granted: Jan 12, 1999
Est. expiryDec 1, 2017(expired)· nominal 20-yr term from priority
Inventors:Robert W. ArfeleGeorge A. EspirituEd Martin
59
PatentIndex Score
10
Cited by
37
References
1
Claims

Claims

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

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