Granted Patent
Utility
US 4,268,650 · App. 06/068,467
Sulphonated polyaryletherketones
Inventor:
John B. Rose
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Aug 21, 1979
Inventor
John B. Rose
Assignee (at issue)
IMPERIAL CHEMICAL INDUSTRIES LIMITED
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.