Granted Patent
Utility
US 5,674,594 · App. 08/295,096
Plain surface acoustical product
Inventor:
Darryl L. Sensenig
Patented Case
View Patent ↗
Granted: Oct 7, 1997
Filed: Aug 24, 1994
Inventor
Darryl L. Sensenig
Assignee (at issue)
ARMSTRONG WORLD 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.