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:
Dec. 24, 2013
Filed:
Aug. 26, 2010
William J. Walker, Toledo, OH (US);
Michael E. Saccoccia, Toledo, OH (US);
William J. Walker, Toledo, OH (US);
Michael E. Saccoccia, Toledo, OH (US);
Federal-Mogul Ignition Company, Southfield, MI (US);
Abstract
A spark plug includes an insulator formed of a ceramic material. The ceramic material comprises AlOin an amount of 98.00 wt % to 99.50 wt %; Group 2 oxides in an amount of 0.16 wt % to 0.70 wt %; SiOin an amount of 0.25 wt % to 0.75 wt %, Group 4 oxides in an amount of 0.01 wt % to 0.16 wt %, Group 1 oxides in an amount less than 0.0060 wt %, and POin an amount of less than 0.0040 wt %. The AlOis formed of particles having a D50 median particle size by volume of 1.2 μm to 1.8 μm. The ceramic material is pressed, sintered, and formed to a predetermined shape. The sintered ceramic material includes a glass phase comprising the AlO, Group 2 oxides, and SiO. The sintered ceramic material also includes secondary crystals of calcium hexa-aluminate (CaAlO) spinel (MgAlO), anorthite (CaAlSiO), and mullite (AlSiO).