Granted Patent
Utility
US 6,364,121 · App. 09/357,049
Filter cartridge with grommet spring
Inventors:
Leon P. Janik, Michael J. Williams
Patented Case
View Patent ↗
Granted: Apr 2, 2002
Filed: Jul 19, 1999
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.