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. 27, 1976
Filed:
Jun. 19, 1974
Norio Yano, Fussa, JA;
Seiei Okoshi, Kawasaki, JA;
Sadayuki Mitsuhashi, Tokyo, JA;
Norio Suzuki, Tokyo, JA;
Nippon Telegraph & Telephone Public Corporation, Tokyo, JA;
Nippon Electric Company, Limited, Tokyo, JA;
Abstract
An electromagnetic matrix switch device, suitable for use in an automatic exchange or computer, comprising a two-dimensional array of cross-point elements, each of which comprises a magnetically actuated switch adapted to bridge its associated pair of row and column signal lines and a magnetic core positioned in magnetically-coupled relationship to the switch to actuate it in response to a current pulse applied to its associated pair of row and column control lines. Each magnetic core has provided therearound first and second windings connected to its associated row control line and third and fourth windings connected to its associated column control line, the polarity of those windings being such that application of the current pulse to the row and column control lines will cause the first and fourth windings to produce magnetic fields in a direction opposite to those produced by the second and third windings. Provision is made for short-circuiting the second and third windings of each magnetic core simultaneously with the application of the current pulse to a selected pair of the control lines, whereby only the magnetic core located at the intersection of the selected pair of the control lines produces a magnetic field sufficient to actuate its associated switch.