| (19) |
 |
|
(11) |
EP 0 260 870 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
19.04.1989 Bulletin 1989/16 |
| (43) |
Date of publication A2: |
|
23.03.1988 Bulletin 1988/12 |
| (22) |
Date of filing: 09.09.1987 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT NL |
| (30) |
Priority: |
12.09.1986 US 906819
|
| (71) |
Applicant: MINNESOTA MINING AND MANUFACTURING COMPANY |
|
St. Paul,
Minnesota 55133-3427 (US) |
|
| (72) |
Inventor: |
|
- Hopstock,David M.
St, Paul, Minnesota 55133 (US)
|
| (74) |
Representative: Baillie, Iain Cameron et al |
|
c/o Ladas & Parry
Altheimer Eck 2
80331 München
80331 München (DE) |
|
| |
|
| (54) |
Polymeric bonded metal magnet with corrosion resistant metal particles |
(57) A highly stable, non-pyrophoric, highly corrosion resistant magnetic powder provided
by treating magnetic particles with a solution containing chromate or dichromate ions
and polymeric magnets containing the powder.