Granted Patent
Utility
US 4,318,142 · App. 06/109,013
Automatically compensated movable head servo circuit and method
Inventor:
Raymond F. Ravizza
Patented Case
View Patent ↗
Granted: Mar 2, 1982
Filed: Dec 31, 1979
Inventor
Raymond F. Ravizza
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.