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:
Sep. 30, 2003
Filed:
Jul. 05, 2001
Karin Naumann, Ober-Olm, DE;
Norbert Greulich-Hickmann, Mainz, DE;
Uwe Kolberg, Mainz-Kastel, DE;
Werner Kiefer, Mainz, DE;
Other;
Abstract
The silicate glass has a composition (in % by weight, based on oxide) of SiO , 54-72; Al O , 0.5-7; ZrO , >10-<18; B O , 0-<5; Na O, 2-<10; K O 0-5; with Na O+K O, 2-<10; caO, 3-11; MgO, 0-10; SrO, 0-8; BaO, 0-12; with CaO+MgO+SrO+BaO, >5-24; La O , 0-6; and TiO , 0-4. The glass has at least 0.6% by weight of La O or at least 0.1% by weight TiO . The glass is in hydrolytic glass 1, acid class 3 or better, preferably acid class 1, and lye class 1. It has a glass transition temperature (T ) of at least 640° C., a thermal expansion coefficient (&agr; ) of 4.1×10 to 8.0×10 /K, a refractive index (n ) of 1.53 to 1.63, an Abbé number (&ngr; ) of 47 to 66 and a negative anomalous partial dispersion in a blue spectral region (&Dgr;P ) of up to −0.0130.