Granted Patent
Utility
US 4,310,051 · App. 06/102,881
Well safety valve apparatus
Inventor:
James D. Mott
Patented Case
View Patent ↗
Granted: Jan 12, 1982
Filed: Dec 12, 1979
Inventor
James D. Mott
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.