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. 19, 1977
Filed:
Oct. 03, 1975
Fritz Hammon, Ludwigshafen, DT;
Georg Schnell, Ludwigshafen, DT;
Karl-Juergen Reimer, Ludwigshafen, DT;
BASF Aktiengesellschaft, Ludwigshafen, DT;
Abstract
This invention concerns methods and devices for switching a tape-recorder or cassette tape-recorder and especially recorders on which tapes with different magnetic coatings can be used. According to the invention, at least one section along the magnetic tape which has a much higher electric resistance than the magnetic coating is used in conjunction with arrangements of simple layout and in advantageous manner to monitor the resistance of the tape either continuously or sporadically, and at least one predetermined switching state of the recorder is allocated to each different resistance value. This ensures reliable switching of any such states as 'machine on', 'machine off' or 'iron oxide (chromium dioxide) tape' bias, without any other special changes at the magnetic tape or at the cassette.