Granted Patent
Utility
US 4,331,464 · App. 06/239,780
Glass sheet support of ring-like configuration
Inventors:
George R. Claassen, John J. Ewing
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Mar 2, 1981
Inventors
George R. Claassen
John J. Ewing
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.