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. 05, 1999
Filed:
Oct. 08, 1997
Yukio Chiba, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A communication system for connecting a terminal through a communication channel for a communication signal and a control channel for the control signal is constructed by a decoder for decoding a dial signal such as a push button signal that is generated from the terminal, a transmitting unit for transmitting a dial signal according to an output of the decoder to an external line at the time of a current supply, a power supply unit for supplying a current to a dial signal generator provided for the terminal when the terminal is in an off-hook state, and a setting unit for setting control data for the communication system in accordance with the output of the decoder, wherein when a power failure occurs, the dial signal that is generated from the terminal is transmitted to the external line without passing through the decoder.