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. 28, 2011
Filed:
Jun. 15, 2007
Applicant:
John W. Hoffman, Perrysburg, OH (US);
Inventor:
John W. Hoffman, Perrysburg, OH (US);
Assignee:
Federal-Mogul World Wide, Inc., Southfield, MI (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01T 13/38 (2006.01);
U.S. Cl.
CPC ...
Abstract
A spark plug having a glass seal formed from a first glass material and a second glass material. The first glass material has a glass transition temperature/softening point that is greater than the glass transition temperature/softening point of the second glass material. The first glass material and second glass material form a matrix and when combined with a filler have thermal expansion rates and properties the approximate leaded glass.