Granted Patent
Utility
US 4,280,153 · App. 06/090,137
Digitally controlled automatic bias circuit for magnetic recording
Inventor:
Lucas K. Tin
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: Nov 1, 1979
Inventor
Lucas K. Tin
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.