Granted Patent
Utility
US 4,853,083 · App. 07/238,405
Method of forming beater-saturated sheet using carbonate ion
Inventor:
Jack F. Blevins
Patented Case
View Patent ↗
Granted: Aug 1, 1989
Filed: Oct 3, 1988
Inventor
Jack F. Blevins
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.