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:
Mar. 02, 1982
Filed:
Feb. 13, 1980
Applicant:
Inventor:
Frederick J Jeffers, Escondido, CA (US);
Assignee:
Spin Physics, Inc., San Diego, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 17 ; 360 66 ;
Abstract
By recording an alternating signal in an ancillary recording medium having high coercivity, such medium will exhibit an external field of a given strength. The ancillary medium is placed in proximation to the record zone of a signal-carrying magnetic head cooperative with a primary magnetic recording medium of lesser coercivity, the fields of the head and ancillary medium algebraically adding to effect signal recording in the primary medium. When the field of the ancillary medium has a strength approximating the coercivity of the primary medium, the signal current applied to the magnetic head may be quite small.