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:
Feb. 12, 1991
Filed:
Mar. 13, 1989
Applicant:
Inventor:
Sachima Tani, Tokyo, JP;
Assignees:
Teac Corporation, Tokyo, JP;
Access Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; G11B / ;
U.S. Cl.
CPC ...
360128 ;
Abstract
A head demagnetizing device has an overall configuration similar to a standard cassette. Within the case is a demagnetizing electromagnet disposed such that it will be juxtaposed to the head to be demagnetized when the cassette-type device is inserted within a tape recorder. Also included in the case are an electrical system for exciting the electromagnet, a switch for connecting the electromagnet to the circuit for exciting the electromagnet, and an operating member that slides with respect to the electromagnet to activate the switch.