Granted Patent
Utility
US 4,332,861 · App. 06/209,637
Plastic surface treatment
Inventors:
Helmut Franz, James H. Hanlon, Lloyd G. Shick
Patented Case
View Patent ↗
Granted: Jun 1, 1982
Filed: Nov 24, 1980
Inventors
Helmut Franz
James H. Hanlon
Lloyd G. Shick
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.