Granted Patent
Utility
US 6,500,335 · App. 09/785,675
Filter system base module with self-locking cartridge retainer
Inventors:
Leon P. Janik, Michael J. Williams
Patented Case
View Patent ↗
Granted: Dec 31, 2002
Filed: Feb 16, 2001
Inventors
Leon P. Janik
Michael J. Williams
Assignee (at issue)
Stanadyne LLC
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.