Granted Patent
Utility
US 4,690,980 · App. 06/864,579
Acrylic modified polymers
Inventors:
Debra L. Singer, William J. Birkmeyer, Rostyslaw Dowbenko, Charles M. Kania
Patented Case
View Patent ↗
Granted: Sep 1, 1987
Filed: May 20, 1986
Inventors
Debra L. Singer
William J. Birkmeyer
Rostyslaw Dowbenko
Charles M. Kania
Assignee (at issue)
PPG Industries, 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.