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:
Jan. 29, 1980
Filed:
May. 10, 1977
Applicant:
Inventors:
Hidetaka Yamashita, Kamakura, JP;
Yuji Miura, Yokohama, JP;
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04Q / ;
U.S. Cl.
CPC ...
3401 / ; 179 / ; 307256 ;
Abstract
In a switching network having cross-points constituted by semiconductor switch elements of four-layer structure of PNPN, communication channels are connected in an unbalanced configuration, and all vertical or column buses and horizontal or row buses constituting the switching matrix are individually grounded through respective capacitors, whereby the semiconductor switch elements are inhibited from erroneous firings due to application of voltages having a high raise-up rate such as high frequency noises, thereby to protect the switching network from erroneous switching operations without increasing cross-talk.