Granted Patent
Utility
US 4,904,533 · App. 07/294,880
Glass sheet heat treated by opposed burners
Inventor:
Harold A. McMaster
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Jan 9, 1989
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.