Granted Patent
Utility
US 4,394,064 · App. 06/278,957
Durable ceramic enamel spandrels
Inventor:
Samuel Dauson
Patented Case
View Patent ↗
Granted: Jul 19, 1983
Filed: Jun 30, 1981
Inventor
Samuel Dauson
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.