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. 12, 1994
Filed:
Mar. 26, 1991
Takashi Aoki, Hino, JP;
Yoshikazu Sano, Hino, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
The telephone system comprises a central or key service unit 1, data terminal units 5.sub.1 to 5.sub.n, and data set circuits of data terminal interface units 27.sub.1 to 27.sub.n for communications between the central unit 1 and the data terminal units 5.sub.1 to 5.sub.n, respectively. The central unit 1 includes a time switch 17 for executing exchange service and a control unit 19 for controlling the time switch 17. Each interface unit 27.sub.1 to 27.sub.n is connected to the time switch 17for communication of communication-data and connected to the control unit 19 for communication of control-data. Each interface unit 27.sub.1 to 27.sub.n enables and disables communication of communication-data between each data terminal 5.sub.1 to 5.sub.n and the time switch 17 in response to predetermined control commands received from each data terminal unit 5.sub.1 to 5.sub.n.