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:
Feb. 21, 1978
Filed:
Oct. 13, 1976
Applicant:
Inventors:
Assignee:
Nippon Electric Co., Ltd., Tokyo, JA;
Primary Examiner:
Int. Cl.
CPC ...
H01H / ; H04M / ; H04Q / ;
U.S. Cl.
CPC ...
179 / ; 335112 ; 335152 ; 3401 / ;
Abstract
Signal switching devices employing electromagnetic switching elements having particular application in the switching network of automatic telephone exchanges are disclosed. The switching devices are of the kind comprising an input and output signal line electromagnetic switching matrix. The switching devices include a cutoff circuit and/or off-normal circuit integrated with the switching matrix.