Granted Patent
Utility
US 4,882,397 · App. 07/156,844
Method for converting polyketals to polyaryletherketones in the presence of a metal salt
Inventor:
Donald R. Kelsey
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Feb 17, 1988
Inventor
Donald R. Kelsey
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.