| (19) |
 |
|
(11) |
EP 0 096 591 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
11.07.1984 Bulletin 1984/28 |
| (43) |
Date of publication A2: |
|
21.12.1983 Bulletin 1983/51 |
| (22) |
Date of filing: 08.06.1983 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT NL SE |
| (30) |
Priority: |
08.06.1982 ZA 824008
|
| (71) |
Applicant: BOART INTERNATIONAL LIMITED |
|
() |
|
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| |
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(57) In a diamond impregnated bit scourer particles in the form of silicon carbide are
added to the matrix. The mesh size of the silicon carbide is less than that of diamond
and the concentration preferably about 40, if the diamond concentration is 40.