Granted Patent
Utility
US 6,372,472 · App. 09/406,018
Filter media containing powered cellulose and immobilized lipase for swimming pool and spa water filteration
Inventors:
Barry L. Nehls, Karen A. Nehls
Patented Case
View Patent ↗
Granted: Apr 16, 2002
Filed: Sep 24, 1999
Inventors
Barry L. Nehls
Karen A. Nehls
Assignee (at issue)
Swim Pure 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.