Granted Patent
Utility
US 5,008,137 · App. 07/367,992
Barrier coatings
Inventors:
Richard M. Nugent, Jr., Ken W. Niederst, Jerome A. Seiner
Patented Case
View Patent ↗
Granted: Apr 16, 1991
Filed: Jun 19, 1989
Inventors
Richard M. Nugent, Jr.
Ken W. Niederst
Jerome A. Seiner
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.