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:
Sep. 07, 1976
Filed:
Mar. 13, 1975
Gunzo Kita, Tokyo, JA;
Kouichi Ohyama, Tokyo, JA;
Iwatsu Electric Co., Ltd., Tokyo, JA;
Abstract
In a communication system of a key telephone system wherein a key telephone selected by electric power supplied from a key service unit is started through a signal line for performing an independent calling, the key service unit is provided with a voice switch adapted to switch between transmission and reception of speech, each key telephone is provided with answer signal sending means including a microphone, and a common line is connected to the outputs of the answer signal sending means of respective key telephones for sending the outputs to the voice switch, thus permitting a selected key telephone to perform a hand-free communication.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile