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:
Oct. 12, 1976
Filed:
Jan. 27, 1975
Richard E Fayling, White Bear Lake, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A magnetic recording medium having at least two particle populations that may be either contained in a single layer of magnetic medium or a dual layer of magnetic medium. In a first embodiment one of the particle populations of the medium is formed of conventional magnetic recording particles and the other population is highly anisotropic. In a second embodiment both particle populations are highly anisotropic but they are aligned so that the easy axes of magnetization of the populations are at an angle to one another. Also disclosed is a machine readable magnetic recording document that employs the magnetic recording medium of the present invention, and an apparatus for reading such document and validating the same.