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:
May. 22, 1984
Filed:
Apr. 22, 1981
Takashi Hirayama, Tachikawa, JP;
Yuichi Igarashi, Sukagawa, JP;
Iwasaki Tsushinki Kabushiki Kaisha, Tokyo, JP;
Abstract
A signal transmission system which perform two-way signal transmission between a first transmitter-receiver and a second transmitter-receiver via a pair of signal lines and supplies a DC current from the first transmitter-receiver to the second transmitter-receiver. In each of the first transmitter-receiver and the second transmitter-receiver, there are provided a current varying circuit for varying a signal line current by a transmission pulse signal so that the signal line current may assume a value in a predetermined current region lower than a minimum level of a load current to the other transmitter-receiver during sending out a signal pulse, a current detector for detecting a current or voltage variation in the signal line current, and a gate circuit for blocking the detected output from the current detector while the transmission pulse is sending out to the current varying circuit.