Granted Patent
Utility
US 4,715,898 · App. 06/880,379
Sulfonium resins useful as pigment grinding vehicles in cationic electrodeposition
Inventor:
Mark W. Johnson
Patented Case
View Patent ↗
Granted: Dec 29, 1987
Filed: Jun 30, 1986
Inventor
Mark W. Johnson
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.