Granted Patent
Utility
US 4,889,890 · App. 07/139,489
Powder coating curing system containing a beta-hydroxyalkylamide
Inventors:
Paul R. Kerr, Paul H. Pettit, Jr., William S. Ewing
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Dec 30, 1987
Inventors
Paul R. Kerr
Paul H. Pettit, Jr.
William S. Ewing
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.