Granted Patent
Utility
US 5,397,465 · App. 08/273,607
Diatomaceous swimming pool filter with regenerative plates
Inventor:
Howard M. Stewart
Patented Case
View Patent ↗
Granted: Mar 14, 1995
Filed: Jul 12, 1994
Inventor
Howard M. Stewart
Assignee (at issue)
Jacuzzi 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.