Granted Patent
Utility
US 4,284,960 · App. 06/096,727
Photo-feedback preamplifier circuit
Inventor:
John O. Ryan
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Nov 23, 1979
Inventor
John O. Ryan
Assignee (at issue)
Ampex Corporation
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.