Granted Patent
Utility
US 4,401,161 · App. 06/339,972
Oil well tool retrieving device
Inventor:
Kenneth R. Warren
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: Jan 15, 1982
Inventor
Kenneth R. Warren
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.