Granted Patent
Utility
US 5,044,889 · App. 07/523,981
Phase adjustable metering pump, and method of adjusting the flow rate thereof
Inventor:
Dennis Pinkerton
Patented Case
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Granted: Sep 3, 1991
Filed: May 16, 1990
Inventor
Dennis Pinkerton
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.