Granted Patent
Utility
US 5,182,355 · App. 07/829,706
Polyurethane polyanhydride oligomers and method of preparation
Inventors:
Jonathan T. Martz, Karl F. Schimmel, Padmanabhan Sundararaman, David N. Walters
Patented Case
View Patent ↗
Granted: Jan 26, 1993
Filed: Sep 30, 1991
Inventors
Jonathan T. Martz
Karl F. Schimmel
Padmanabhan Sundararaman
David N. Walters
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.