Granted Patent
Utility
US 6,637,625 · App. 09/838,674
Continuous positive displacement metering valve
Inventor:
Richard Jefferson
Patented Case
View Patent ↗
Granted: Oct 28, 2003
Filed: Apr 19, 2001
Inventor
Richard Jefferson
Assignee (at issue)
Delaware Capital Formation, Inc.
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.