Granted Patent
Utility
US 4,401,000 · App. 06/365,697
Tong assembly
Inventor:
Robert B. Kinzbach
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Apr 5, 1982
Inventor
Robert B. Kinzbach
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.