Granted Patent
Utility
US 4,291,783 · App. 06/141,871
Acoustical panel for suspended ceilings
Inventor:
David A. Harris
Patented Case
View Patent ↗
Granted: Sep 29, 1981
Filed: Apr 21, 1980
Inventor
David A. Harris
Assignee (at issue)
Owens-Corning Fiberglas Corp.
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.