Granted Patent
Utility
US 5,226,483 · App. 07/846,797
Safety valve landing nipple and method
Inventor:
Jimmie R. Williamson, Jr.
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Mar 4, 1992
Inventor
Jimmie R. Williamson, Jr.
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.