Granted Patent
Utility
US 6,793,808 · App. 09/901,632
Combination valve support and sealing element for filter cartridges
Inventor:
Darrell T. McKenzie
Patented Case
View Patent ↗
Granted: Sep 21, 2004
Filed: Jul 11, 2001
Inventor
Darrell T. McKenzie
Assignee (at issue)
DANA LIMITED
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.