Granted Patent
Utility
US 5,400,306 · App. 08/071,169
Differential detection assembly for data retrieval from a data storage disk
Inventor:
Bernard W. Bell, Jr.
Patented Case
View Patent ↗
Granted: Mar 21, 1995
Filed: Jun 2, 1993
Inventor
Bernard W. Bell, Jr.
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.