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. 30, 2013
Filed:
Jun. 21, 2010
Burkhard Speit, Mainz, DE;
Silke Wolff, Hueckeswagen, DE;
Thorsten Doehring, Mainz, DE;
Schott AG, Mainz, DE;
Abstract
The space glass has a composition, in wt. % based on oxide content, of: SiO, 5-65; BO, 0-40; AlO, 0-12; PbO, 25-50; NaO 0-8; KO, 0-20; Σ alkali metal oxides, at least 0.25; and at least 0.1 wt. % of a total amount of three or more doping agents selected from CeO, MoO, BiO, WO, AgO, SnO, SbOand AsO. In addition, it contains one or more of the following doping agents in the following amounts: at most 1 wt. %, CeO; at most 0.02 wt. %, AsO; at most 0.3 wt. %, SbO; and at most 0.5 wt. %, SnO. Light-weight optical systems for space are made from it, because of its high radiation resistance. A preferred process for making space glass includes melting the oxide starting ingredients at 1050° C. to 1200° C. to form a melt and refining the melt at 1230° C. to 1350° C.