Granted Patent
Utility
US 5,822,147 · App. 08/648,586
Position control apparatus and method with a digital filter and a phase change filter section in a disk storage device
Inventor:
Masashi Kisaka
Patented Case
View Patent ↗
Granted: Oct 13, 1998
Filed: May 16, 1996
Inventor
Masashi Kisaka
Assignee (at issue)
International Business Machines 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.