Global Patent Index - EP 1021382 A1

EP 1021382 A1 2000-07-26 - THERMAL DIMENSIONAL STABILITY TREATMENT OF VITREOUS SHEET MATERIAL BY CONTACTING WITH A MOLTEN ALKALI METAL SALT

Title (en)

THERMAL DIMENSIONAL STABILITY TREATMENT OF VITREOUS SHEET MATERIAL BY CONTACTING WITH A MOLTEN ALKALI METAL SALT

Title (de)

BEHANDLUNG VON FLACHGLAS MIT GESCHMOLZENEM ALKALISALZ ZUR STEIGERUNG DESSEN THERMALER FORMSTABILITÄT

Title (fr)

TRAITEMENT D'UN MATERIAU VITREUX, AYANT POUR BUT DE LUI CONFERER UNE STABILITE DIMENSIONNELLE A LA CHALEUR, PAR CONTACT AVEC UN SEL D'UN METAL ALCALIN FONDU

Publication

EP 1021382 A1 (EN)

Application

EP 98944903 A

Priority

  • BE 9800137 W
  • GB 9720230 A

Abstract (en)

[origin: GB2329382A] A sheet of vitreous material for use as a substrate is produced by subjecting the sheet to chemical tempering with a molten alkali metal salt prior to any firing step or other heat treatment associated with the application of coating layers. The so-treated sheet has improved dimensional stability, such that wide ranges of heating and cooling applied by the heat treatment do not create an unacceptable amount of shrinkage of the vitreous material. Preferably the glass sheet is immersed in KNO3 for 4-72 hours at 400-500‹C before being slowly cooled in two stages.

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

C03C 21/00

IPC 8 full level (invention and additional information)

C03C 21/00 (2006.01)

CPC (invention and additional information)

C03C 21/002 (2013.01)

Citation (search report)

See references of WO 9915471A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

GB 2329382 A 19990324; GB 9720230 D0 19971126; AU 9246398 A 19990412; CN 1121991 C 20030924; CN 1271335 A 20001025; EP 1021382 A1 20000726; JP 2001517599 A 20011009; TW 546263 B 20030811; WO 9915471 A1 19990401

INPADOC legal status


2002-07-31 [18R] REFUSED

- Ref Legal Event Code: 18R

- Effective date: 20020222

2001-01-17 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20001205

2000-07-26 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000425

2000-07-26 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

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