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. 11, 1977
Filed:
Sep. 23, 1974
Sidney J Cherry, Elmira, NY (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
A vacuum-type circuit interrupter has a condensing shield which is maintained at a predetermined potential relevant to the separable contacts by the use of resistance means, which are tapped off to the condensing shield. The resistance means may assume either the form of a surface coating with a preselected resistance on the inside or the outside of the insulating envelope casing, or the resistance means could be a ceramic envelope casing having a preselected volume resistance. Additionally, the use of coatings of metals and/or semiconductors on the inside and/or the outside of the insulating envelope casing may be used to obtain the desired preselected surface resistance values. Even external circuitry, connected to the condensing shield and the contacts, may be used to achieve the proper resistance values. The foregoing arrangements prevent the condensing shield from 'floating' in potential value relevant to the separable electrodes, and gives rise to desirable results.