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:
Jun. 06, 2006
Filed:
Nov. 05, 2002
John Anthony Burrows, Northwich, GB;
John Anthony Burrows, Northwich, GB;
Federal-Mogul Ignition (UK) Limited, Merseyside, GB;
Abstract
A spark plug () comprises an electrically-insulating sleeve (), a first electrode (), an electrically-conducting shell () surrounding said sleeve, and a second electrode () mounted on said shell. The electrodes (and) define a spark gap (G) of the plug. The shell () has an end portion () terminating at an end surface () of the shell. The sleeve () extends past said end portion () with a clearance therebetween and extends beyond said end surface (). The sleeve () has at least one projection () which projects from the sleeve () and reduces said clearance in the region of the end surface (), thereby forming a secondary spark gap (G).