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. 28, 2009
Filed:
Dec. 05, 2007
Thorsten Doehring, Mainz, DE;
Ina Mitra, Stadecken-Elsheim, DE;
Thorsten Doehring, Mainz, DE;
Ina Mitra, Stadecken-Elsheim, DE;
Schott AG, Mainz, DE;
Abstract
An optical glass for the manufacture of large transmission optics, such as lenses having a thickness of 100 millimeters or more, comprises 35 to 70 wt.-% SiO, 17 to 35 wt.-% AlO, 3 to 17 wt.-% PO, 0 to 6 wt.-% LiO, 0,5 to 4 wt.-% MgO, 0,5 to 3 wt.-% ZnO, a maximum of 1 wt.-% CaO, a maximum of 0,5 wt.-% BaO, 0,5 to 6 wt.-% TiO, 0,5 to 3 wt.-% ZrO, 0 to 1 wt.-% NaO, 0 to 1 wt.-% KO, a maximum of 1 wt.-% of refining agents (AsO, SPO) and a maximum of 500 ppm of other contaminants. The glass composition may be equal to the composition of the glass ceramic Zerodur® and allows to manufacture large transmission optics in a cost-effective way, has a maximum of transmittance which is in the range of a He—Ne lasers and has a CTE of about 3·10/K.