Granted Patent
Utility
US 4,576,358 · App. 06/486,909
Remotely operable safety valve
Inventors:
James D. Mott, Danny K. Wolff
Patented Case
View Patent ↗
Granted: Mar 18, 1986
Filed: Apr 20, 1983
Inventors
James D. Mott
Danny K. Wolff
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.