(19)
(11)
EP 0 429 557 A1
(12)
(43)
Date of publication:
05.06.1991
Bulletin 1991/23
(21)
Application number:
90902739.0
(22)
Date of filing:
27.12.1989
(51)
International Patent Classification (IPC):
C01B
31/
30
( . )
C01B
31/
36
( . )
(86)
International application number:
PCT/US1989/005871
(87)
International publication number:
WO 1990/008102
(
26.07.1990
Gazette 1990/17)
(84)
Designated Contracting States:
AT BE CH DE FR GB IT LI NL SE
(30)
Priority:
11.01.1989
US 19890295682
(71)
Applicant:
THE DOW CHEMICAL COMPANY
Midland, Michigan 48640 (US)
(72)
Inventor:
MOORE, William, G.
Midland, MI 48640 (US)
(74)
Representative:
Sternagel, Hans-Günther, Dr., et al
Patentanwälte Dr. Michael Hann Dr. H.-G. Sternagel Sander Aue 30
D-51465 Bergisch Gladbach
D-51465 Bergisch Gladbach (DE)
(54)
METHOD AND APPARATUS FOR PRODUCING BORON CARBIDE CRYSTALS