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. 21, 2004
Filed:
Aug. 13, 2002
Applicant:
Inventors:
Assignee:
Schott Glas, Mainz, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 3/091 ;
U.S. Cl.
CPC ...
C03C 3/091 ;
Abstract
The borosilicate glass has a hydrolytic stability class of 1, an acid resistance class of 1 and a lye resistance class of at least 2 and a composition (in % by weight, based on oxide) of SiO 70.5-76.5; B O 6.5-<11.5; Al O 4-8; Li O 0.5-2; Na O 4.5-9; K O 0-5; with Li O+Na O+K O 5.5-10.5; MgO 0-1; CaO 0-2; and CeO 0-1, and optionally refining agents. This borosilicate glass is preferably free of As O , Sb O and BaO and is then especially advantageous as a pharmaceutical packaging material. It also may contain up to 3% by weight TiO to block UV radiation. The borosilicate glass may include up to 0.5% by weight ZrO to reach a lye resistance class of 1.