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:
Apr. 01, 2008
Filed:
Jul. 23, 2004
Paul Tinwell, Northwich, GB;
Gurdev Orjela, Autelbas Barnich, BE;
Robin Hyde, Letchworth, GB;
Duncan Roy Coupland, High Wycombe, GB;
Paul Tinwell, Northwich, GB;
Gurdev Orjela, Autelbas Barnich, BE;
Robin Hyde, Letchworth, GB;
Duncan Roy Coupland, High Wycombe, GB;
Federal-Mogul Ignition (U.K.) Limited, Manchester, GB;
Johnson Matthey Public Limited Company, London, GB;
Abstract
An ignition device such as a spark plug having ground and center electrodes, at least one of which includes a firing tip formed from an alloy containing iridium, rhodium, tungsten, and zirconium. With the inclusion of tungsten and zirconium in the alloy, the percentage of rhodium can be kept relatively low without sacrificing the erosion resistance or reduced sparking voltage of the firing tip. In one embodiment, the firing tip contains 2% rhodium, 0.3% tungsten, 0.02% zirconium, and the balance iridium.