Granted Patent
Utility
US 5,114,552 · App. 06/833,872
Compositions comprising ionic resins and capped polyisocyanate mixtures containing a diphenyl-2,4'-diisocyanate and a diphenyl-4,4'-diisocyanate
Inventors:
Gregory J. McCollum, George W. Mauer
Patented Case
View Patent ↗
Granted: May 19, 1992
Filed: Feb 25, 1986
Inventors
Gregory J. McCollum
George W. Mauer
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.