Granted Patent
Utility
US 4,833,551 · App. 07/017,571
Dual head servo system and method for a magnetic disk
Inventor:
Hubert Song
Patented Case
View Patent ↗
Granted: May 23, 1989
Filed: Feb 24, 1987
Inventor
Hubert Song
Assignee (at issue)
Konishiroku Photo Industries Co., Ltd.
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.