Granted Patent
Utility
US 4,895,916 · App. 07/215,105
Water treatment polymers and methods of use thereof
Inventors:
Fu Chen, William S. Carey
Patented Case
View Patent ↗
Granted: Jan 23, 1990
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.