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:
Jan. 28, 1986
Filed:
Jun. 14, 1984
Leonard E Curtin, Houston, TX (US);
Harris Corporation, Melbourne, FL (US);
Abstract
A party line interface for permitting connection of a standard two-wire telephone designed for non-party line use to a party line system which rings subscribers by party line ringing signals of different frequencies. The interface includes circuitry for generating a ring command signal in response to the receipt of a party line ringing signal of a specified single frequency chosen from the group of possible ringing frequencies of the party line. The party line ringing frequency to which the circuitry for generating the ring command signal responds is programmable to permit selection of the particular party line ringing frequency to which the ring command signal will be generated in response thereto. Circuitry is provided for producing a ringing signal of a standard frequency designed to ring a standard telephone in response to the ring command signal.