Granted Patent
Utility
US 4,645,820 · App. 06/795,039
Partially crystalline poly(sulfone ester) resin
Inventor:
Barry D. Dean
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Nov 4, 1985
Inventor
Barry D. Dean
Assignee (at issue)
Atlantic Richfield 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.