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. 08, 1985
Filed:
Feb. 28, 1983
Gerhard Lange, Berlin, DE;
Jurgen Boy, Berlin, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
A surge arrester, includes a gas-filled housing, copper electrodes disposed opposite each other in the housing, the electrodes each including a relatively thin-walled truncated conical part having a flange integral therewith and a solid cylindrical part, the cylindrical parts each having a respective end surface facing each other, the end surfaces being mutually spaced apart by a given distance and each having a trough-shaped axially-symmetrical depression formed therein, a highly active electrode activating compound filling each of the depressions, a tubular ceramic insulator at least partly surrounding the electrodes defining respective annular gaps between the insulator and each of the cylindrical parts having widths being substantially between 0.2 mm and 0.4 mm, the gaps including rear spaces being low in vapor depositions, the insulator having end surfaces being vacuum-tightly hard soldered to the flanges, and at least one ignition line disposed on the insulator and respectively projecting into each of the gaps and into the rear spaces by at least 1.5 mm, the given distance between the end surfaces of the cylindrical parts being at most 3.5 times the width of one of the gaps in vicinity of the at least one ignition line, the electrodes defining a discharge space including the gaps having a volume of at least 20 mm.sup.3.