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. 23, 1982
Filed:
Jul. 05, 1979
Alexander G Gilberts, Algonquin, IL (US);
Reliable Electric Company, Franklin Park, IL (US);
Abstract
A surge voltage arrester assembly comprises a primary gas tube surge arrester and an air gap secondary arrester that provides surge protection should the gas tube become vented to atmosphere. The secondary arrester has the air gap defined by a rim of one of the gas tube electrodes and an opposed roughened surface of a metallic cup into which the gas tube is positioned. The roughened cup surface has a coating of graphite applied thereto. The electrode rim may or may not be roughened and/or coated. In a three element version of the invention wherein the gas tube has two line electrodes and a ground electrode, metallic cups are provided at opposite ends of the gas tube to cooperate with the ground electrode for forming secondary air gaps for each line electrode. The cup surfaces at the secondary air gaps are roughened and graphite coated. An O-ring seals each secondary air gap against the entrance of contaminants.