Granted Patent
Utility
US 4,580,790 · App. 06/622,895
Sintered polytetrafluoroethylene composite material and seal assembly
Inventor:
Paul R. Doose
Patented Case
View Patent ↗
Granted: Apr 8, 1986
Filed: Jun 21, 1984
Inventor
Paul R. Doose
Assignee (at issue)
Hughes Aircraft 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.