Granted Patent
Utility
US 5,284,205 · App. 07/861,995
Metal to metal seal for well safety valve
Inventor:
Roddie R. Smith
Patented Case
View Patent ↗
Granted: Feb 8, 1994
Filed: Apr 1, 1992
Inventor
Roddie R. Smith
Assignee (at issue)
Halliburton
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.