Granted Patent
Utility
US 4,620,864 · App. 06/754,572
Glass sheet tempering utilizing heating and quenching performed in ambient at superatmospheric pressure
Inventor:
Harold A. McMaster
Patented Case
View Patent ↗
Granted: Nov 4, 1986
Filed: Jul 15, 1985
Inventor
Harold A. McMaster
Assignee (at issue)
Glasstech, 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.