Granted Patent
Utility
US 4,586,094 · App. 06/589,007
Method and apparatus for pre-recording tracking information on magnetic media
Inventors:
John M. Chambors, Francis Lum
Patented Case
View Patent ↗
Granted: Apr 29, 1986
Filed: Mar 13, 1984
Inventors
John M. Chambors
Francis Lum
Assignee (at issue)
Irwin Magnetic 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.