Granted Patent
Utility
US 5,148,876 · App. 07/712,529
Lightweight drill pipe
Inventor:
Gerald E. Wilson
Patented Case
View Patent ↗
Granted: Sep 22, 1992
Filed: Jun 10, 1991
Inventor
Gerald E. Wilson
Assignee (at issue)
Prideco, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.