Granted Patent
Utility
US 4,859,461 · App. 07/046,378
Coatable ion exchange resins
Inventors:
San-Laung Chow, Yegnaswami Raghunathan
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: May 4, 1987
Inventors
San-Laung Chow
Yegnaswami Raghunathan
Assignee (at issue)
Fisons Ltd.
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.