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:
Apr. 27, 1999
Filed:
Oct. 28, 1997
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A telephone apparatus is connected to a plurality of telephone lines and has a transfer function for transferring a call among the plurality of telephone lines. The telephone apparatus includes circuit interfaces each of which has a 2-4 line substitution function and conducts an interface function between each of the plurality of telephone lines and a telephone apparatus internal circuit. A first amplifier amplifies a signal from a first telephone line and a second amplifier amplifies a signal from a second telephone line. A control unit compares the levels of the signals from the first and second telephone lines to control the amplification factors of the first and second amplifiers on the basis of a result of the comparison.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile