Granted Patent
Utility
US 4,385,989 · App. 06/302,540
Filter assembly and cartridge therefor
Inventor:
Jerry Margolis
Patented Case
View Patent ↗
Granted: May 31, 1983
Filed: Sep 16, 1981
Inventor
Jerry Margolis
Assignee (at issue)
Metaframe, 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.