(19)
(11) EP 0 397 684 A1

(12)

(43) Date of publication:
22.11.1990 Bulletin 1990/47

(21) Application number: 89900739.0

(22) Date of filing: 28.11.1988
(51) International Patent Classification (IPC): 
C04B 35/ 06( . )
C01B 13/ 14( . )
C01B 17/ 20( . )
C01B 21/ 076( . )
C01B 31/ 34( . )
C01B 35/ 04( . )
C30B 9/ 00( . )
C30B 29/ 10( . )
 B22F 9/ 16( . )
C01B 13/ 32( . )
C01B 21/ 06( . )
C01B 31/ 30( . )
C01B 33/ 06( . )
C22C 1/ 05( . )
C30B 9/ 10( . )
C30B 29/ 36( . )
(86) International application number:
PCT/US1988/004235
(87) International publication number:
WO 1989/005280 (15.06.1989 Gazette 1989/13)
(84) Designated Contracting States:
DE FR GB IT NL SE

(30) Priority: 30.11.1987 US 19870126328

(71) Applicant: MARTIN MARIETTA CORPORATION
Bethesda, MD 20817 (US)

(72) Inventors:
  • NAGLE, Dennis, Charles
    Ellicott City, MD 21043 (US)
  • BRUPBACHER, John, Michael
    Catonsville, MD 21228 (US)
  • CHRISTODOULOU, Leontios
    Baltimore, MD 21228 (US)

(74) Representative: Thomas, Roger Tamlyn, et al 
D. Young & Co. 21 New Fetter Lane
London EC4A 1DA
London EC4A 1DA (GB)

   


(54) PROCESS FOR FORMING FINE CERAMIC POWDERS AND PRODUCTS THEREOF