Granted Patent
Utility
US 5,300,334 · App. 07/991,484
Pressurizable thermoplastic container having an exterior polyurethane layer and its method of making
Inventors:
Ken W. Niederst, John R. Zern, Jerome A. Seiner
Patented Case
View Patent ↗
Granted: Apr 5, 1994
Filed: Dec 16, 1992
Inventors
Ken W. Niederst
John R. Zern
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.