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:
Jan. 20, 2015
Filed:
Aug. 27, 2012
Applicants:
Erhard Dick, Pechbrunn, DE;
Joerg Hinrich Fechner, Mainz, DE;
Inventors:
Erhard Dick, Pechbrunn, DE;
Joerg Hinrich Fechner, Mainz, DE;
Assignee:
Schott AG, Mainz, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C 3/091 (2006.01);
U.S. Cl.
CPC ...
C03C 3/091 (2013.01);
Abstract
A glass composition and its use for producing glass tubes is provided. The glass tubes having the provided composition are particularly suitable for the outer tubes of fluorescent lamps in the case of which a phosphor layer is baked at temperatures of up to 700° C. The tubes composed of the glass of the provided composition have a lower tendency to deform or stick together when processed at high temperatures. To obtain the observed effects, the molar ratio of NaO/(NaO+KO), inter alia, is greater than 0.4 and not more than 0.72.