Granted Patent
Utility
US 5,375,476 · App. 08/129,660
Stuck pipe locator system
Inventor:
Kevin L. Gray
Patented Case
View Patent ↗
Granted: Dec 27, 1994
Filed: Sep 30, 1993
Inventor
Kevin L. Gray
Assignee (at issue)
Wetherford U.S., 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.