Granted Patent
Utility
US 6,223,789 · App. 09/339,558
Regulation of vapor pump valve
Inventor:
Wolfgang Koch
Patented Case
View Patent ↗
Granted: May 1, 2001
Filed: Jun 24, 1999
Inventor
Wolfgang Koch
Assignee (at issue)
TOKHEIM HOLDING B.V.
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.