Granted Patent
Utility
US 4,419,486 · App. 06/267,288
Sulphonated polyaryletherketones
Inventor:
John B. Rose
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: May 26, 1981
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.