Granted Patent
Utility
US 4,868,263 · App. 07/214,989
Novel amine-containing copolymers and their use
Inventors:
Fu Chen, William S. Carey
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Jul 5, 1988
Inventors
Fu Chen
William S. Carey
Assignee (at issue)
Betz Laboratories, 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.