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:
Feb. 26, 1991
Filed:
Aug. 07, 1989
Katsuhiro Kakizawa, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There is provided a key telephone system for transmitting and receiving a dial number by a peculiar control signal between a main unit and an extension telephone. The system comprises: an extension telephone; a main unit; an analyzing unit for analyzing an audio signal; and a calling unit for calling in accordance with the result by the analysis of the analyzing means. The calling unit generates a dial pulse. When a calling request from the extension telephone is detected, the main unit connects the extension telephone and the analyzing unit. Information generated by an electronic apparatus via which the dial number can be independently registered from an extension telephone of the KTs is analyzed and calling or displaying can be executed.