USD404407SExpiredUtility

Eight blade drill bit

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Assignee: DRESSER INDPriority: Mar 5, 1998Filed: Mar 5, 1998Granted: Jan 19, 1999
Est. expiryMar 5, 2018(expired)· nominal 20-yr term from priority
Inventors:Robert W. ArfeleGeorge A. EspirituEd Martin
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PatentIndex Score
2
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37
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1
Claims

Claims

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

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