Granted Patent
Utility
US 4,340,412 · App. 06/222,396
Float glass forming chamber with externally supported roof
Inventor:
Earl L. May
Patented Case
View Patent ↗
Granted: Jul 20, 1982
Filed: Jan 5, 1981
Inventor
Earl L. May
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.