Granted Patent
Utility
US 4,917,409 · App. 07/240,679
Tubular connection
Inventor:
Doyle E. Reeves
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Sep 6, 1988
Inventor
Doyle E. Reeves
Assignee (at issue)
Hydril 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.