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, 1989
Filed:
Dec. 21, 1988
Applicant:
Inventors:
Motoyoshi Fujita, Chiba, JP;
Akikazu Kunuki, Funabashi, JP;
Noboru Uemura, Odawara, JP;
Tsutomu Kotani, Kamagaya, JP;
Shunpei Saeki, Chiba, JP;
Toshiharu Kawano, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360128 ;
Abstract
A magnetic head of a cassette tape recorder set is demagnetized by a demagnetizer mounted in a tape cassette housing. The demagnetizer has an erase head which faces with the magnetic head which is subject to a demagnetizing action, a pair of rotatable rings which engage with spindles of the tape recorder set, energizing means for energizing said erase head with AC decreasing current, and coupling means for coupling said rings for simultaneous rotation of the rings.