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. 26, 1976
Filed:
Jul. 28, 1975
Joseph J Zimmermann, Elm Grove, WI (US);
GTE Automatic Electric Laboratories Incorporated, Northlake, IL (US);
Abstract
Apparatus in an automatic telephone answering device utilizing a single motor for scanning a tone arm across a grooveless recording disc to selectively play back a message magnetically recorded thereon in a spiral path as well as for rotating the turntable. The apparatus includes an electromagnetic clutch powered by a positive belt drive coupled to the motor for driving a spirally contoured cam to transport the tone arm across the disc. A control circuit including an optoelectronic switch positioned adjacent the edge of the turntable to receive light reflected from a reflective spot on the turntable edge is also provided to initiate scanning by the tone arm coincident with the reflective spot passing by the optoelectronic switch. This insures that the tone arm transducer will begin scanning at the same point for each subsequent playback and/or record operation and, as a result, track the spiral recording path on the grooveless disc.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile