Granted Patent
Utility
US 4,303,435 · App. 06/211,597
Glass ribbon float tank with a pyrometer assembly having a heated viewing tube and method of use
Inventor:
George E. Sleighter
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Dec 1, 1980
Inventor
George E. Sleighter
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.