Granted Patent
Utility
US 6,435,475 · App. 09/835,986
Valve body with integral seal retention groove
Inventor:
George H. Blume
Patented Case
View Patent ↗
Granted: Aug 20, 2002
Filed: Apr 16, 2001
Inventor
George H. Blume
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.