(19)
(11)
EP 0 449 990 A1
(12)
(43)
Date of publication:
09.10.1991
Bulletin 1991/41
(21)
Application number:
90902580.0
(22)
Date of filing:
19.12.1989
(51)
International Patent Classification (IPC):
C04B
35/
56
( . )
C04B
35/
58
( . )
C04B
35/
645
( . )
C04B
35/
575
( . )
C04B
35/
593
( . )
(86)
International application number:
PCT/US1989/005838
(87)
International publication number:
WO 1990/006906
(
28.06.1990
Gazette 1990/15)
(84)
Designated Contracting States:
AT BE CH DE ES FR GB IT LI LU NL SE
(30)
Priority:
22.12.1988
US 19880288208
13.12.1989
US 19890450200
(71)
Applicant:
NORTON COMPANY
Worcester, MA 01606-2698 (US)
(72)
Inventor:
TEWARI, Param, H.
Hudson, MA 01749 (US)
(74)
Representative:
Zumstein, Fritz, Dr.
Patentanwälte, Dr. F. Zumstein, Dipl.-Ing. F. Klingseisen, Bräuhausstrasse 4
D-80331 München
D-80331 München (DE)
(54)
UNIFORMLY-COATED CERAMIC PARTICLES