Granted Patent
Utility
US 4,534,775 · App. 06/601,946
Air treatment filter element and air treatment filter
Inventor:
Stephen E. Frazier
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Apr 19, 1984
Inventor
Stephen E. Frazier
Assignee (at issue)
General Time Corporation
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.