Granted Patent
Utility
US 5,248,323 · App. 07/973,777
Vacuum cleaner and filter thereof
Inventor:
Philip H. Stevenson
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Nov 9, 1992
Inventor
Philip H. Stevenson
Assignee (at issue)
Health-Mor, 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.