Granted Patent
Utility
US 5,169,540 · App. 07/816,902
Stable blends of cationic water-in-oil emulsion polymers and cationic aqueous solution polymers
Inventors:
Bruce K. Fillipo, John F. Walko, David Devore
Patented Case
View Patent ↗
Granted: Dec 8, 1992
Filed: Jan 3, 1992
Inventors
Bruce K. Fillipo
John F. Walko
David Devore
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.