Granted Patent
Utility
US 5,169,537 · App. 07/832,562
Water soluble terpolymers and methods of use thereof
Inventor:
Fu Chen
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Feb 7, 1992
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.