Granted Patent
Utility
US 5,971,034 · App. 09/005,387
Thermal duct lining insulation
Inventors:
Kenneth Heisey, Paul A. Hough
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Jan 9, 1998
Inventors
Kenneth Heisey
Paul A. Hough
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.