Granted Patent
Utility
US 5,629,385 · App. 08/344,191
Allylamine copolymers having phosphonic, carboxylic or sulfonic groups and N-oxide derivatives thereof
Inventor:
Lawrence L. Kuo
Patented Case
View Patent ↗
Granted: May 13, 1997
Filed: Nov 23, 1994
Inventor
Lawrence L. Kuo
Assignee (at issue)
Betzdearborn, Inc.
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.