Granted Patent
Utility
US 4,442,736 · App. 06/416,405
Power pipe tong rotary plunger inserter
Inventors:
Martin E. True, Terry D. Timmerman
Patented Case
View Patent ↗
Granted: Apr 17, 1984
Filed: Sep 9, 1982
Inventors
Martin E. True
Terry D. Timmerman
Assignee (at issue)
Weatherford/Lamb, 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.