Granted Patent
Utility
US 4,820,790 · App. 07/025,367
Chain-extended poly(aryl ether ketones)
Inventors:
Paul A. Winslow, Markus Matzner
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Mar 13, 1987
Inventors
Paul A. Winslow
Markus Matzner
Assignee (at issue)
Amoco Corporation
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.