Granted Patent
Utility
US 4,839,571 · App. 07/026,964
Safety back-up for metering pump control
Inventors:
Robert E. Farnham, Fredric W. Prill
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Mar 17, 1987
Inventors
Robert E. Farnham
Fredric W. Prill
Assignee (at issue)
Barber-Greene Company
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.