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. 27, 1977
Filed:
Feb. 20, 1976
Satoshi Yamauchi, Yokohama, JA;
Shigeru Yamazaki, Tanashi, JA;
Ricoh Co., Ltd., Tokyo, JA;
Abstract
An intercommunication system in a group teaching or training system in which a teacher station and a plurality of student stations are interconnected with a common outgoing line and a common incoming line, and each station includes a transmitter and a receiver, and wherein the teacher station includes a switching circuit for selectively connecting the incoming line to the outgoing line, the transmitter and receiver in each student station are selectively connected through switching circuits to the incoming and outgoing lines, respectively, and the switching circuits in each student station may be selected in synchronism with the timing with which the teacher station sequentially scans the student station.