Granted Patent
Utility
US 4,306,706 · App. 06/074,530
Cryogenic valve seal
Inventors:
Ronald A. Olansen, John M. Cory, Harry C. Champlin, Jr.
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Sep 11, 1979
Inventors
Ronald A. Olansen
John M. Cory
Harry C. Champlin, Jr.
Assignee (at issue)
Posi-Seal International, Inc.
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.