Global Patent Index - EP 1032000 A1

EP 1032000 A1 2000-08-30 - CORROSION-RESISTANT PERMANENT MAGNET AND METHOD FOR PRODUCING THE SAME

Title (en)

CORROSION-RESISTANT PERMANENT MAGNET AND METHOD FOR PRODUCING THE SAME

Title (de)

KORROSIONSRESISTENTE DAUERMAGNET UND IHRES HERSTELLUNGSVERFAHREN

Title (fr)

AIMANT PERMANENT RESISTANT A LA CORROSION ET SON PROCEDE DE FABRICATION

Publication

EP 1032000 A1 (EN)

Application

EP 99943247 A

Priority

  • JP 9904915 W
  • JP 25651698 A

Abstract (en)

The present invention provides an Fe-B-R based permanent magnet, which has a chemical conversion coating film formed on its surface with an aluminum film interposed therebetween, the chemical conversion coating film containing at least one of titanium and zirconium, phosphorus, oxygen and fluorine as constituting elements, and a process for producing such an Fe-B-R based permanent magnet. In the permanent magnet, the chemical conversion coating film is adhered firmly to the magnet with the aluminum film interposed therebetween and hence, the magnet is excellent in corrosion resistance. Even if the magnet is left to stand for a long time under high-temperature and high-humidity conditions of a temperature of 80 DEG C and a relative humidity of 90 %, the magnet exhibits a stable high magnetic characteristic which cannot be deteriorated. Moreover, the film is free from hexa-valent chromium.

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

H01F 1/057

IPC 8 full level (invention and additional information)

H01F 41/02 (2006.01)

CPC (invention and additional information)

H01F 41/026 (2013.01)

Designated contracting state (EPC)

DE GB

EPO simple patent family

EP 1032000 A1 20000830; EP 1032000 A4 20030502; EP 1032000 B1 20040714; DE 69918660 D1 20040819; DE 69918660 T2 20050728; HK 1027207 A1 20041224; WO 0016347 A1 20000323

INPADOC legal status


2016-10-31 [PGFP DE] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: DE

- Payment date: 20160907

- Year of fee payment: 18

2016-10-31 [PGFP GB] POSTGRANT: ANNUAL FEES PAID TO NATIONAL OFFICE

- Ref Country Code: GB

- Payment date: 20160907

- Year of fee payment: 18

2005-07-06 [26N] NO OPPOSITION FILED

- Effective date: 20050415

2005-06-29 [REG IE MM4A] PATENT LAPSED

2004-12-24 [REG HK GR] STANDARD PATENTS GRANTED IN HONG KONG

- Document: HK 1027207

2004-09-08 [RAP2] TRANSFER OF RIGHTS OF AN EP GRANTED PATENT

- Owner name: NEOMAX CO., LTD.

2004-08-25 [REG IE FG4D] EUROPEAN PATENTS GRANTED DESIGNATING IRELAND

2004-08-19 [REF] CORRESPONDS TO:

- Document: DE 69918660 P 20040819

2004-07-14 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE GB

2004-07-14 [REG GB FG4D] EUROPEAN PATENT GRANTED

2003-08-06 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20030617

2003-05-02 [A4] DESPATCH OF SUPPLEMENTARY SEARCH REPORT

- Effective date: 20030318

2003-05-02 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: 7H 01F 1/057 A

2003-05-02 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: 7H 01F 41/02 B

2000-08-30 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000505

2000-08-30 [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