Granted Patent
Utility
US 5,211,846 · App. 07/559,321
Replacement filter cartridge assembly
Inventors:
Leonard B. Kott, Aaron D. Kott
Patented Case
View Patent ↗
Granted: May 18, 1993
Filed: Jul 30, 1990
Inventors
Leonard B. Kott
Aaron D. Kott
Assignee (at issue)
Pleatco Electronic & Filter 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.