Granted Patent
Utility
US 4,946,491 · App. 07/274,459
Method and apparatus for glass tempering
Inventor:
Jonathan Barr
Patented Case
View Patent ↗
Granted: Aug 7, 1990
Filed: Nov 21, 1988
Inventor
Jonathan Barr
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.