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. 21, 2016
Filed:
Apr. 10, 2014
Schott Ag, Mainz, DE;
Oliver Hochrein, Mainz, DE;
Inge Burger, Wiesbaden, DE;
Irmgard Westenberger, Mainz, DE;
Jochen Alkemper, Klein-Winternheim, DE;
Gerd Rudas, Jugenheim, DE;
Katharina Alt, Mainz, DE;
Gordon Kissl, Heidesheim, DE;
Gunther Paulus, Mainz, DE;
SCHOTT AG, Mainz, DE;
Abstract
A glass element is provided that is made of a glass having SiO, AlO, BO, and NaO. The glass has a scratch tolerance that when scratches of 1 mm length are introduced using a Knoop diamond indenter which presses upon a surface of the glass with a force of 4 Newton and is displaced along the surface with a traverse speed of 0.4 mm/s, not more than 20% of the scratches have a noticeable width including visible chipping of more than 25 μm. In some embodiments, the glass, after chemical tempering, has sodium ions that are at least partially exchanged for potassium ions so that a compressive stress zone is provided at the surface of the glass. The compressive stress is at least 700 MPa and an exchange depth of alkali ions is at least 25 μm.