Granted Patent
Utility
US 4,428,421 · App. 06/301,772
Wireline winch mounting system
Inventor:
E. Edward Rankin
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Sep 14, 1981
Inventor
E. Edward Rankin
Assignee (at issue)
H-G Testing Company
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.