Granted Patent
Utility
US 4,370,891 · App. 06/283,000
Dual element-single oscillator-ratio type digital transducer
Inventors:
William Pickering, David J. Urbanc
Patented Case
View Patent ↗
Granted: Feb 1, 1983
Filed: May 26, 1981
Inventors
William Pickering
David J. Urbanc
Assignee (at issue)
Caterpillar Tractor Co.
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.