Global Patent Index - EP 1027401 A1

EP 1027401 A1 2000-08-16 - USE AS PHOSPHOR DOT IN A PLASMA OR X-RAY SYSTEM OF A LANTHANUM PHOSPHATE COMPRISING THULIUM

Title (en)

USE AS PHOSPHOR DOT IN A PLASMA OR X-RAY SYSTEM OF A LANTHANUM PHOSPHATE COMPRISING THULIUM

Title (de)

ANWENDUNG ALS LEUCHTMITTEL IN EINEM PLASMASYSTEM ODER RÖNTGENSTRAHLENSYSTEM VON EINEM LANTHANUM- PHOSPHAT MIT THULIUM

Title (fr)

UTILISATION COMME LUMINOPHORE DANS UN SYSTEME A PLASMA OU A RAYONNEMENT X, D'UN PHOSPHATE DE LANTHANE COMPRENANT DU THULIUM

Publication

EP 1027401 A1 (FR)

Application

EP 98951544 A

Priority

  • FR 9802275 W
  • FR 9713367 A

Abstract (en)

[origin: FR2770223A1] Thulium-containing lanthanum phosphate is used as a blue-emitting phosphor in an X-ray or plasma system.- DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: - (i) an X-ray or plasma system which includes a thulium-containing lanthanum phosphate as phosphor; - (ii) a lanthanum phosphate and a lanthanum phosphate-based phosphor which contain thulium and which consist of particles of 1-20 microns average size with a dispersion index of less than 0.6; and - (iii) preparation of the above lanthanum phosphate by introducing a solution of lanthanum, thulium and optionally gadolinium salts into a phosphate ion-containing solution of pH less than 3, controlling the pH at a constant value of less than 2 during precipitation, and then recovering and optionally thermally treating the precipitate.- Preferred Feature: The lanthanum phosphate contains 0.1-10 (especially 0.5-5) atom % thulium and may also contain gadolinium

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

C09K 11/81

IPC 8 full level (invention and additional information)

G21K 4/00 (2006.01); C01B 25/45 (2006.01); C09K 11/77 (2006.01); C09K 11/81 (2006.01)

CPC (invention and additional information)

C09K 11/7777 (2013.01)

Designated contracting state (EPC)

DE FR GB NL

EPO simple patent family

FR 2770223 A1 19990430; FR 2770223 B1 20020614; CA 2307132 A1 19990506; CN 1278855 A 20010103; EP 1027401 A1 20000816; JP 2001521055 A 20011106; KR 20010015788 A 20010226; US 6419852 B1 20020716; WO 9921938 A1 19990506

INPADOC legal status


2004-09-15 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040304

2000-08-16 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000519

2000-08-16 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB NL