Granted Patent
Utility
US 3,939,119 · App. 04/147,599
Aromatic polyether-polythioether-polysulfone thermoplastics
Inventor:
Francis X. O'Shea
Patented Case
View Patent ↗
Granted: Feb 17, 1976
Filed: May 27, 1971
Inventor
Francis X. O'Shea
Assignee (at issue)
Uniroyal Ltd.
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.