Granted Patent
Utility
US 4,864,434 · App. 07/275,854
Method for writing a tri-phase servo pattern which provides information for positioning the transducers of a magnetic storage device
Inventor:
Donald W. Janz
Patented Case
View Patent ↗
Granted: Sep 5, 1989
Filed: Nov 25, 1988
Inventor
Donald W. Janz
Assignee (at issue)
Magnetic Peripherals, Inc.
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.