The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 18, 1978
Filed:
Dec. 10, 1976
Applicant:
Inventors:
William J Hale, Kettering, OH (US);
William R Horst, Dayton, OH (US);
Donald A Walker, Kettering, OH (US);
Assignee:
NCR Corporation, Dayton, OH (US);
Primary Examiner:
Int. Cl.
CPC ...
G03G / ; G01R / ;
U.S. Cl.
CPC ...
346 741 ; 324212 ; 360117 ;
Abstract
A multi-track magnetic recording head is used to record data in human readable form on a magnetic track on a record medium. A viewer, having a viewing window containing microencapsulated ferromagnetic particles, is used to read the data. When the viewing window is placed in operative proximity with the magnetic track, an image corresponding to the data on the track is formed on the viewing window to enable a user of the record medium to read the data thereon. The image on the viewing window is erased after reading by providing relative movement between the viewing window and a magnetic field.