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:
Oct. 05, 1982
Filed:
Nov. 25, 1980
Tetsuro Inomata, Kawasaki, JP;
Kazutada Katsukura, Tachikawa, JP;
Hikaru Takematsu, Higashikurume, JP;
Abstract
A channel switching network, in which each cross-point of a switch matrix is constituted as a channel switch of balanced type using two PNPN semiconductor elements. Each of the two PNPN semiconductor elements is arranged in a forward direction with respect to a direct current flowing from the channel switching network to a corresponding terminal equipment. A column of cross-points and a line of cross-points in the switch matrix are designated to select a simultaneously designated cross-point in response to a pair of selection signals. A control circuit is provided for each pair of the incoming lines and the outgoing lines of the switch matrix so that the terminal voltage of a power source for flowing the direct current in the PNPN elements is controlled to temporarily rise to turn ON the PNPN elements at the selected cross-point and thereafter to drop to such a value as only to maintain the PNPN elements in the ON states.