Granted Patent
Utility
US 4,901,485 · App. 07/334,039
Acoustical panel
Inventors:
Robert J. Menchetti, Andrew E. Heuer
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Apr 6, 1989
Inventors
Robert J. Menchetti
Andrew E. Heuer
Assignee (at issue)
National Gypsum Company
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.