Précédent
Suivant
Brevet : EP0852977 - POUDRE A PELLICULE MULTICOUCHE SUR SA SURFACE ET SON PROCEDE DE PREPARATION
Titre
POUDRE A PELLICULE MULTICOUCHE SUR SA SURFACE ET SON PROCEDE DE PREPARATION
N° et date de publication de la demande
EP0852977 - 15/07/1998
Type de la demande
A1
N° et date de dépôt
EP96906004.5 - 13/03/1996
N° et date de priorité
JP8083295 - 14/03/1995
Classification CIB
B22F 1/16 ; B22F 1/18 ; C03C 17/34 ; C09C 1/00 ; C09C 3/06 ; C09D 5/36 ; G03G 9/083 ; H01F 1/06 ; H01F 1/24
Classification CPC
B82Y 30/00 ; C01P2002/84 ; C01P2004/10 ; C01P2004/12 ; C01P2004/20 ; C01P2004/32 ; C01P2004/39 ; C01P2004/40 ; C01P2004/61 ; C01P2004/62 ; C01P2004/64 ; C01P2004/80 ; C01P2006/60 ; C03C 17/3417 ; C09C 1/0081 ; C09C 3/063 ; C09C 3/066 ; C09D 5/36 ; G03G 9/0832 ; G03G 9/0834 ; G03G 9/0837 ; G03G 9/0839 ; H01F 1/061 ; H01F 1/24 ; Y10T 428/12181 ; B22F 1/16 ; B22F 1/18 ; B22F 1/16 ; B22F 1/18 ; Y10T 428/12181 ; B82Y 30/00 ; G03G 9/0832 ; H01F 1/061 ; C01P2004/62 ; C09C 1/0081 ; C01P2004/64 ; H01F 1/24 ; C01P2004/61 ; C09C 3/063 ; C03C 17/3417 ; G03G 9/0834 ; C01P2004/12 ; C01P2004/39 ; C01P2004/40 ; C01P2004/20 ; C09D 5/36 ; C01P2006/60 ; G03G 9/0839 ; C09C 3/066 ; G03G 9/0837 ; C01P2004/32 ; C01P2002/84 ; C01P2004/10 ; C01P2004/80 ; B22F 1/16 ; B22F 1/18
Famille de brevets
DE69628570T2 ; ATE242072T1 ; DK0852977T3 ; PT852977E ; WO9628269A1 ; CA2215402A1 ; US5985466A ; AU4953596A ; CN1183741A ; EA199700228A1 ; KR19980702986A ; NO974203L ; ES2197234T3 ; JP3330613B2 ; EP0852977A1 ; HK1010851A1
Abrégé
Résumé dans la langue de publication, traduction non disponible A powder having metal oxide films on its surface is obtained in which the films have a heightened refractive index and which hence shows a high reflectance and has a bright color. A powder is obtained which has a reduced number of metal oxide films on the surface and hence has a small particle diameter. A powder having a multilayered film on the surface which comprises a base particle having on the surface thereof a multilayered film comprising at least a metal oxide film formed by the hydrolysis of a metal alkoxide, and in which the multilayered film has undergone a heat treatment. A process for producing any of the above powders which comprises dispersing a base particle into a solution of a metal alkoxide, hydrolyzing the metal alkoxide to obtain a metal oxide and deposit a film of the metal oxide on the surface of the base particle, conducting the foregoing steps two or more times to form a multilayered film, and performing a heat treatment in at least the final step, and in which the multilayered film is regulated so as to have an appropriate combination of constituent materials and appropriate film thicknesses to change the interference colors of the multilayered film and thus impart a bright color to the powder.
INTERVENANTS
Déposant
NITTETSU MINING CO LTD (NITTETSU MINING CO., LTD.) - JP
NAKATSUKA KATSUTO (NAKATSUKA, KATSUTO) - JP
Titulaire
NITTETSU MINING CO., LTD.
Inventeur
NAKATSUKA KATSUTO (NAKATSUKA, KATSUTO) - JP
ATARASHI TAKAFUMI (ATARASHI, TAKAFUMI) - JP
Mandataire
CABINET BEAU DE LOMENIE - 158 RUE DE L UNIVERSITE - 75340 PARIS CEDEX 07 - FR - N° Siren : 775671076
STATUT EN FRANCE : Dossier déchu définitivement
Délivrance
04/06/2003
Remise de traduction du brevet
02/04/2004 (BOPI 2004-14)
Date de constatation de déchéance
-
30/11/2007 (BOPI 2008-01)
Dernière annuité payée
08/03/2006
Quantième- N° de l'annuité payée
11
