Granted Patent
Utility
US 4,298,511 · App. 06/174,479
Urethane rheology modifiers and compositions containing same
Inventors:
Karl F. Schimmel, Jerome A. Seiner, Rostyslaw Dowbenko, Roger M. Christenson
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Aug 1, 1980
Inventors
Karl F. Schimmel
Jerome A. Seiner
Rostyslaw Dowbenko
Roger M. Christenson
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.