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. 18, 1977
Filed:
Apr. 14, 1976
Manfred Fichter, Konigsfeld, DT;
Kienzle Apparate GmbH, Villingen-Schwenningen, DT;
Abstract
The record carrier is made of a material which can be caused to assume a dark state by passing a magnetic field through the record carrier normal thereto. It can be caused to assume a light state by establishing in the general plane of the record carrier two magnetic fields which are oriented generally perpendicular to each other. The recording apparatus which incorporates the record carrier is provided with means for effecting record carrier transport past an erasing unit and a writing unit. The writing unit forms a recording trace on the record carrier during such transport by generating a radial field lying in the general plane of the record carrier. Because this field is radial it is comprised of field components which are oriented generally perpendicular to each other and which furthermore are oriented at angles to the record carrier transport direction. The erasing unit erases the recording trace formed by the writing unit by establishing a magnetic field which extends transverse to the record carrier transport direction and which is comprised of field lines passing through the record carrier normal thereto.