Granted Patent
Utility
US 4,892,906 · App. 07/250,275
Urethane coating composition
Inventors:
Phung N. Pham, William E. Michael
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Sep 28, 1988
Inventors
Phung N. Pham
William E. Michael
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.