IP Library › Granted Patent US 4,548,431
Granted Patent Utility
US 4,548,431 · App. 06/661,533

Tool joint with internal/external make-up shoulders

Inventors: James R. Hall, Robert A. Cunningham
Patented Case View Patent ↗
Granted: Oct 22, 1985 Filed: Oct 16, 1984
Inventors
James R. Hall
Robert A. Cunningham
Assignee (at issue)
Hughes Tool Company - USA

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Quick Facts
Patent No.
US 4,548,431
App. No.
06/661,533
Filed
1984-10-16
Granted
1985-10-22
Kind
A