USD331586SExpiredUtility

Exterior wiper head for drill pipe

20
Individually held — no corporate assignee on recordPriority: Oct 9, 1990Filed: Oct 9, 1990Granted: Dec 8, 1992
Est. expiryOct 9, 2010(expired)· nominal 20-yr term from priority
Inventors:Ronald J. MasonSteven Mason
20
PatentIndex Score
0
Cited by
6
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for an exterior wiper head for drill pipe, as shown and described.

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