Granted Patent
Utility
US 5,368,074 · App. 07/877,404
Well casing thread protector
Inventor:
Terry Hall
Patented Case
View Patent ↗
Granted: Nov 29, 1994
Filed: May 1, 1992
Inventor
Terry Hall
Assignee (at issue)
Connection Technology Ltd.
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.