Granted Patent
Utility
US 4,866,099 · App. 07/024,198
Membrane
Inventor:
Brian N. Hendy
Patented Case
View Patent ↗
Granted: Sep 12, 1989
Filed: Mar 10, 1987
Inventor
Brian N. Hendy
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.