Granted Patent
Utility
US 4,428,008 · App. 06/364,692
Electronic switching circuit for use in magnetic head drives
Inventor:
John S. Fawkes
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Apr 2, 1982
Inventor
John S. Fawkes
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.