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:
Nov. 23, 1999
Filed:
Mar. 11, 1998
Applicant:
Inventors:
Assignee:
Vetrotech Saint-Gobain International AG, Walchwil, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C03C / ;
U.S. Cl.
CPC ...
501 70 ; 501 72 ;
Abstract
Use is made, for the manufacture of fire-resistant glazings of the G fire-resistance classes, comprising panes made of glass toughened by the thermal route by means of a conventional toughening plant and possessing safety glass properties, of glasses which exhibit a thermal expansion coefficient .alpha..sub.20-300 of between 6 and 8.5.times.10.sup.-6 K.sup.-1, a thermal stress factor .phi. of between 0.5 and 0.8N/(mm.sup.2.K), a softening point of between 750 and 830.degree. C. and a transformation point of at the very most 1190.degree. C.