Granted Patent
Utility
US 6,676,387 · App. 10/018,334
Metering pump with a rotary valve responsive to electrical signals from the contact between a fluid responsive shuttle and dual probes
Inventor:
Laurence Richard Penn
Patented Case
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Granted: Jan 13, 2004
Filed: Apr 16, 2002
Inventor
Laurence Richard Penn
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.