Granted Patent
Utility
US 4,479,050 · App. 06/334,761
Sensor alignment circuit and method of operation
Inventor:
David J. Helffrich
Patented Case
View Patent ↗
Granted: Oct 23, 1984
Filed: Dec 28, 1981
Inventor
David J. Helffrich
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.