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:
Jun. 06, 2017
Filed:
Sep. 30, 2010
Felix Greuter, Baden-Ruetihof, CH;
Michael Hagemeister, Zurich, CH;
Oliver Beck, Wettingen, CH;
Ragnar Osterlund, Ludvika, SE;
Reto Kessler, Zurich, CH;
Felix Greuter, Baden-Ruetihof, CH;
Michael Hagemeister, Zurich, CH;
Oliver Beck, Wettingen, CH;
Ragnar Osterlund, Ludvika, SE;
Reto Kessler, Zurich, CH;
ABB SCHWEIZ AG, Baden, CH;
Abstract
The present invention relates to a varistor material for a surge arrester with target switching field strength ranging from 250 to 400 V/mm comprising ZnO forming a ZnO phase and Bi expressed as BiOforming an intergranular bismuth oxide phase, said varistor material further comprising a spinel phase, characterized in that the amount of a pyrochlore phase comprised in the varistor material is such, that the ratio of the pyrochlore phase to the spinel phase is less than 0.15:1.