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:
Apr. 03, 1979
Filed:
Sep. 07, 1977
Applicant:
Inventor:
Tatsuo Fujiwara, Yokohama, JP;
Assignee:
Tokyo Shibaura Electric Co., Ltd., Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
29603 ; 29593 ; 29737 ; 360118 ; 361143 ;
Abstract
Alternate S- and N-poles are disposed on a multipolar erasing head in the direction of a relative movement of the multipolar erasing head to a magnetic recording medium. The multipolar erasing head includes at least one region where the distances between adjacent magnetic poles of the same polarity are successively shortened in the direction for successively erasing the information recorded on the recording medium. A method and apparatus for manufacturing such an erasing head are also disclosed.