Granted Patent
Utility
US 4,572,036 · App. 06/718,203
Power tong and jaw apparatus
Inventor:
James G. Renfro, Jr.
Patented Case
View Patent ↗
Granted: Feb 25, 1986
Filed: Apr 2, 1985
Inventor
James G. Renfro, Jr.
Assignee (at issue)
Hughes Tool Company LLC
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.