Global Patent Index - EP 0931029 A4

EP 0931029 A4 20000510 - METHOD OF MAKING A POLARIZING GLASS

Title (en)

METHOD OF MAKING A POLARIZING GLASS

Title (de)

VERFAHREN ZUR HERSTELLUNG VON POLARISTERENDEM GLAS

Title (fr)

PROCEDE DE FABRICATION DE VERRE POLARISANT

Publication

EP 0931029 A4 (EN)

Application

EP 97941471 A

Priority

  • US 9715895 W
  • US 2725696 P

Abstract (en)

[origin: WO9814409A1] A method of producing a polarizing glass article that exhibits a broad band of high contrast polarizing properties in the infrared region of the radiation spectrum, that is phase-separated or exhibits photochromic properties based on silver, copper, or copper-cadmium halide crystals or a combination thereof precipitated in the glass and having a size in the range of 200-5000 Angströms, and that has a surface layer containing elongated silver, copper, or copper cadmium metal particles, or a mixture of same, the method comprising the step of thermally forming and precipitating large halide crystals by subjecting the glass article to a time-temperature cycle in which the temperature is at least 75 DEG C above the glass softening point. The figure is a graphical representation of stress levels in psi versus center wavelengths (CWLs) in nm, where center wavelength is defined as the center of a given range of polarizing capability. Specifically, the stess levels required to achieve a given center wavelength is compared for two heat treatment cycles. The upper line (A) represents data for the standard heat treatment of polarizing glasses; 710 DEG C for 4 hours. Line (B) represents data for the new high temperature heat treatment of 750 DEG C for 8 hours.

IPC 1-7

C03C 15/00; C03B 37/00; C03C 4/00; C03C 10/16; C03C 14/00

IPC 8 full level

G02B 5/30 (2006.01); C03B 23/00 (2006.01); C03B 32/02 (2006.01); C03C 3/11 (2006.01); C03C 4/00 (2006.01); C03C 4/06 (2006.01); C03C 10/04 (2006.01); C03C 14/00 (2006.01); C03C 15/00 (2006.01); C03C 23/00 (2006.01); G02B 1/00 (2006.01)

CPC (source: EP)

C03B 23/0006 (2013.01); C03B 32/02 (2013.01); C03C 4/06 (2013.01); C03C 14/006 (2013.01); C03C 23/007 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB NL

DOCDB simple family (publication)

WO 9814409 A1 19980409; EP 0931029 A1 19990728; EP 0931029 A4 20000510; JP 2001501163 A 20010130; KR 100490316 B1 20050517; KR 20000048737 A 20000725

DOCDB simple family (application)

US 9715895 W 19970908; EP 97941471 A 19970908; JP 51654998 A 19970908; KR 19997002719 A 19990329