Granted Patent
Utility
US 4,659,481 · App. 06/864,049
Water treatment polymers and methods of use thereof
Inventor:
Fu Chen
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: May 16, 1986
Inventor
Fu Chen
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.