Granted Patent
Utility
US 6,579,455 · App. 09/580,529
Filter and valve apparatus
Inventors:
Tom Muzik, John W. Vickers, John Cannistra
Patented Case
View Patent ↗
Granted: Jun 17, 2003
Filed: May 30, 2000
Inventors
Tom Muzik
John W. Vickers
John Cannistra
Assignee (at issue)
PTI Advanced Filtration, 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.