Global Patent Index - EP 1254080 A1

EP 1254080 A1 2002-11-06 - TRANSPARENT GLASS-CERAMICS BASED ON ALPHA- AND BETA-WILLEMITE

Title (en)

TRANSPARENT GLASS-CERAMICS BASED ON ALPHA- AND BETA-WILLEMITE

Title (de)

TRANSPARENTE GLASSKERAMIK AUF DER BASIS VON ALPHA- UND BETAWILLEMIT

Title (fr)

VITROCERAMIQUES TRANSPARENTS A BASE DE WILLEMITE ALPHA- ET BETA

Publication

EP 1254080 A1 (EN)

Application

EP 00970840 A

Priority

  • US 0028233 W
  • US 16013899 P

Abstract (en)

[origin: WO0128943A1] A glass-ceramic which is substantially and desirably totally transparent, and which contains a willemite predominant crystal phase within the ternary Mg2SiO4-Zn2SiO4-Li4SiO4 system. The glass-ceramic is formed from precursor glasses having the following compositions, in weight percent on an oxide basis, of 25-60 SiO2, 4-20 Al2O3, 20-55 ZnO, 0-12 MgO, 0-18 K2O, 0-12 Na2O, 0-30 GeO2, with the condition that SIGMA K2O+ Na2O >/= 5. The glass-ceramic may be doped with up to 1 wt. % Cr2O3 to impart optical activity thereto.

IPC 1-7 (main, further and additional classification)

C03C 10/04; C09K 11/08; C09K 11/59

IPC 8 full level (invention and additional information)

C03B 32/02 (2006.01); C03C 10/00 (2006.01); C03C 10/04 (2006.01); C09K 11/64 (2006.01); C09K 11/68 (2006.01); G02B 6/02 (2006.01); H01S 3/06 (2006.01); H01S 3/17 (2006.01)

CPC (invention and additional information)

G02B 6/0229 (2013.01); C03B 32/02 (2013.01); C03C 10/0036 (2013.01); C09K 11/646 (2013.01); C09K 11/685 (2013.01)

Citation (search report)

See references of WO 0128943A1

Designated contracting state (EPC)

AT BE CH CY DE FR GB IT LI

EPO simple patent family

WO 0128943 A1 20010426; AU 8016100 A 20010430; CA 2387951 A1 20010426; CN 1184157 C 20050112; CN 1379742 A 20021113; EP 1254080 A1 20021106; JP 2003512281 A 20030402; TW 503225 B 20020921

INPADOC legal status


2011-01-19 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20080503

2008-12-10 [D18D] APPLICATION DEEMED TO BE WITHDRAWN (DELETED)

2004-05-19 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION)

- Designated State(s): AT BE CH CY DE FR GB IT LI

2002-11-06 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020416

2002-11-06 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-11-06 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI