USD307020SExpiredUtility

Drill bit

57
Assignee: LYNG DRILLING PRODUCTS A SPriority: Apr 8, 1987Filed: Apr 8, 1987Granted: Apr 3, 1990
Est. expiryApr 8, 2007(expired)· nominal 20-yr term from priority
Inventors:Bjorn LyngHans Tronstad
57
PatentIndex Score
13
Cited by
7
References
1
Claims

Claims

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

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