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:
Mar. 30, 1982
Filed:
Mar. 19, 1980
Applicant:
Inventors:
Yasuomi Ueta, Yokohama, JP;
Tatsuro Toyama, Kanagawa, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05K / ;
U.S. Cl.
CPC ...
361397 ; 174 685 ; 313325 ; 361212 ;
Abstract
A circuit board formed with a spark gap for protecting a circuit element such as a transistor connected to a picture tube of a television receiver when spark discharge occurring within the picture tube produces a current under a high voltage tending to destroy the transistor. The spark gap comprises a pair of metal balls disposed respectively on the confronting tip portions of a pair of discharge electrodes disposed opposite to each other on an insulator substrate so that spark discharge can always occur across these metal balls without occurring across the electrodes.