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:
Nov. 05, 1985
Filed:
Mar. 08, 1984
Koichi Sekiguchi, Asaka, JP;
Hikaru Takematsu, Higashikurume, JP;
Kazuyuki Yamamoto, Yokohama, JP;
Teruyuki Kubo, Yokohama, JP;
Telegraph & Telephone Pub. Corp., Tokyo, JP;
Iwasaki Tsushinki Kabushiki Kaisha, Tokyo, JP;
Abstract
A control signal transmission system for a key telephone system, in which control signal information is transmitted in a parallel signal configuration between a plurality of key telephone sets and a key service unit by the use of transmission lines one-to-one corresponding to the individual key telephone sets, and in which the information between the key telephone sets is transmitted using a serial signal format of a frame configuration so that time slots of respective frames are synchronized with respect to all of the transmission lines.