Granted Patent
Utility
US 4,539,021 · App. 06/584,287
Gas filtering method using fabric filter
Inventors:
Thomas P. Hager, Larry W. Ferguson
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Feb 27, 1984
Inventors
Thomas P. Hager
Larry W. Ferguson
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.