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:
Sep. 28, 1999
Filed:
May. 28, 1998
Applicant:
Inventors:
Shingo Shirakawa, Hitachi, JP;
Satoshi Watahiki, Hitachi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361117 ; 361 56 ; 361127 ;
Abstract
A tank-type surge arrester includes a zinc oxide element unit having zinc oxide elements, a top shield ring for earth insulation control disposed on top of the zinc oxide element unit, an upper shield ring disposed below the top shield ring in an upper section of the zinc oxide element unit, an expanded lower shield ring disposed below the upper shield ring in the upper section of the zinc oxide element unit, and tubular conductors disposed between the upper and the lower shield rings so as to be included in a vertical plane on an extension of a high-tension conductor.