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:
Aug. 26, 1980
Filed:
Sep. 21, 1978
Alexander Feiner, Rumson, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A two-terminal tone generating hold impedance is disclosed which is powered from a central office telephone line and provides the functions of a hold impedance in a key telephone line circuit while providing an audio tone signal to an associated telephone line when the line is placed in a hold condition. The tone generating hold impedance consists of an oscillator circuit which is self-exciting upon the application of a dc voltage resulting from the connection of the tone generating hold impedance to the telephone line. In another embodiment a line powered music receiver functions as a hold impedance and applies music, received via radio or cable transmission, to the line placed in a hold condition.