Global Patent Index - EP 0994823 A1

EP 0994823 A1 2000-04-26 - PROCESS FOR THE PREPARATION OF LEAD ZIRCONATE TITANATE COMPOUNDS

Title (en)

PROCESS FOR THE PREPARATION OF LEAD ZIRCONATE TITANATE COMPOUNDS

Title (de)

VERFAHREN ZUR HERSTELLUNG VON BLEI ZIRKONATE TITANATE VERBINDUNGEN

Title (fr)

PROCEDE DE PREPARATION DE COMPOSES DE TITANATE ZIRCONATE DE PLOMB

Publication

EP 0994823 A1 (EN)

Application

EP 98932376 A

Priority

  • GB 9801979 W
  • GB 9714150 A

Abstract (en)

[origin: WO9901379A1] A process for producing a lead zirconate titanate compound, which involves the combination of an aqueous solution of a lead salt with a titanium alkoxide compound, followed by the addition of concentrated nitric acid, an aqueous solution of a zirconium salt, and an excess of oxalic acid to yield an oxalate. The pH of the solution containing the oxalate is adjusted by the use of ammonia or an amine, before the oxalate is calcined to yield the lead zirconate titanate compound.

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

C01G 25/00; C01G 33/00

IPC 8 full level (invention and additional information)

C01G 25/00 (2006.01)

CPC (invention and additional information)

C01G 25/006 (2013.01); C01P 2002/34 (2013.01)

Citation (search report)

See references of WO 9901379A1

Designated contracting state (EPC)

DE ES FR GB NL

EPO simple patent family

WO 9901379 A1 19990114; EP 0994823 A1 20000426; GB 9714150 D0 19970910

INPADOC legal status


2001-07-18 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20010123

2000-10-18 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20000831

2000-04-26 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19991209

2000-04-26 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE ES FR GB NL