Granted Patent
Utility
US 5,245,877 · App. 07/668,199
Tong load cell assembly
Inventor:
Graham Ruark
Patented Case
View Patent ↗
Granted: Sep 21, 1993
Filed: Mar 12, 1991
Inventor
Graham Ruark
Assignee (at issue)
Weatherford Holding 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.