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. 15, 1980
Filed:
Jun. 19, 1978
Geoffrey Greenhalgh, Orrell, GB;
Triplex Safety Glass Company Limited, Birmingham, GB;
Abstract
Thermally toughened glass sheets of thickness 2.5 mm to 4.0 mm for use as motor vehicle side or rear windows, are produced by quenching producing an average central tensile stress in the range 62 MN/m.sup.2 to 44.0 MN/n.sup.2. At least one gas jet is directed at the glass sheet to augment toughening stresses and produce at least one strip-shaped region of more highly toughened glass. The central tensile stress in the strip-shaped region is in the range from 2 MN/m.sup.2 to 5 MN/m.sup.2 greater than the average central tensile stress in the glass sheet. There are major and minor principal stresses in the strip-shaped region acting in the plane of the glass sheet. The difference between the major and minor principal stresses is in the range 5 MN/m.sup.2 to 25 MN/m.sup.2.