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:
Aug. 29, 1978
Filed:
Aug. 30, 1976
Owen Farish, Glasgow, GB;
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
An improved gas-type circuit-interrupter is provided utilizing a mixture of helium and sulfur-hexafluoride (SF.sub.6) gases, with the percentage concentration of sulfur-hexafluoride (SF.sub.6) gas being 10%, or less, by volume. The improved gas-type circuit-interrupter of the present invention may be utilized to advantage as a 'puffer-type' circuit-interrupter, in which relative movement between a piston and operating cylinder takes place for forcing the compressed gas to flow through a suitably-located orifice, or nozzle member, and into intimate engagement with the established arc disposed therein to effect its extinction. Another form of the gas-type circuit-interrupter of the present invention may include a pressurized gas-reservoir chamber containing the aforesaid admixture of the helium and sulfur-hexafluoride gases in the proper concentration, that is 10%, or less, by volume, of sulfur-hexafluoride (SF.sub.6) gas with the remaining being made up substantially entirely of helium.