Granted Patent
Utility
US 4,397,672 · App. 06/346,421
Glass sheet tempering utilizing high density air quenching
Inventor:
John S. Nitschke
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Feb 5, 1982
Inventor
John S. Nitschke
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.