Granted Patent
Utility
US 6,679,477 · App. 10/223,304
Valve body with integral seal retention groove
Inventor:
George H. Blume
Patented Case
View Patent ↗
Granted: Jan 20, 2004
Filed: Aug 19, 2002
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.