Granted Patent
Utility
US 4,445,921 · App. 06/460,322
Tempering glass sheets by cooling comprising sublimation quenching
Inventors:
Terry A. Bennett, Herbert W. Eilenfeld, DeWitt W. Lampman
Patented Case
View Patent ↗
Granted: May 1, 1984
Filed: Jan 24, 1983
Inventors
Terry A. Bennett
Herbert W. Eilenfeld
DeWitt W. Lampman
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.