Granted Patent
Utility
US 5,030,748 · App. 07/428,801
Water treatment polymers and methods of use thereof
Inventors:
Fu Chen, William S. Carey
Patented Case
View Patent ↗
Granted: Jul 9, 1991
Filed: Oct 27, 1989
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.