Granted Patent
Utility
US 4,151,570 · App. 05/669,047
Automatic scan tracking using a magnetic head supported by a piezoelectric bender element
Inventors:
Raymond F. Ravizza, James R. Wheeler
Patented Case
View Patent ↗
Granted: Apr 24, 1979
Filed: Mar 22, 1976
Inventors
Raymond F. Ravizza
James R. Wheeler
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.