Granted Patent
Utility
US 4,459,475 · App. 06/363,181
Automatic calibration for D.C. transducers
Inventors:
John R. Flint, Robert F. Johnston
Patented Case
View Patent ↗
Granted: Jul 10, 1984
Filed: Mar 29, 1982
Inventors
John R. Flint
Robert F. Johnston
Assignee (at issue)
Bell and Howell, LLC
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.