Granted Patent
Utility
US 4,951,745 · App. 07/324,029
Stuffing box and grease injector for underwater wells
Inventors:
Ernest B. Gentry, Colin Scott Boyle
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Mar 14, 1989
Inventors
Ernest B. Gentry
Colin Scott Boyle
Assignee (at issue)
Otis Engineering Corporation
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.