Granted Patent
Utility
US 4,819,092 · App. 07/048,017
Apparatus for writing signal density information on a magnetic medium
Inventor:
Alan Richards
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: May 8, 1987
Inventor
Alan Richards
Assignee (at issue)
Colorado Memory Systems, 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.