Granted Patent
Utility
US 5,118,766 · App. 07/383,438
Process of preparing polymer sulphonyl derivatives
Inventors:
Brian N. Hendy, Stella M. Young
Patented Case
View Patent ↗
Granted: Jun 2, 1992
Filed: Jul 24, 1989
Inventors
Brian N. Hendy
Stella M. Young
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.