Granted Patent
Utility
US 6,284,130 · App. 09/244,517
Filter cartridge with clean side anti-drainback valve
Inventor:
Dieter Daniel
Patented Case
View Patent ↗
Granted: Sep 4, 2001
Filed: Feb 4, 1999
Inventor
Dieter Daniel
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.