Granted Patent
Utility
US 4,846,946 · App. 07/131,888
Process for reducing attendant color shift in coatings containing blocked isocyanates
Inventors:
George W. Mauer, Gregory J. McCollum, Peter Kamarchik
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Dec 11, 1987
Inventors
George W. Mauer
Gregory J. McCollum
Peter Kamarchik
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.