Granted Patent
Utility
US 5,720,888 · App. 08/771,361
Water-soluble cationic copolymers and their use as flocculants
Inventors:
Lawrence L. Kuo, Roger Yiming Leung
Patented Case
View Patent ↗
Granted: Feb 24, 1998
Filed: Dec 16, 1996
Inventors
Lawrence L. Kuo
Roger Yiming Leung
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.