(19)
(11) EP 0 357 683 A1

(12)

(43) Date of publication:
14.03.1990 Bulletin 1990/11

(21) Application number: 88906677.0

(22) Date of filing: 06.05.1988
(51) International Patent Classification (IPC): 
C04B 35/ 00( . )
C01G 3/ 00( . )
H01B 12/ 00( . )
H01L 39/ 24( . )
C01G 1/ 00( . )
C04B 35/ 45( . )
H01B 13/ 00( . )
(86) International application number:
PCT/US1988/001434
(87) International publication number:
WO 1988/009555 (01.12.1988 Gazette 1988/26)
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI LU NL SE

(30) Priority: 19.05.1987 US 19870051860
22.07.1987 US 19870076686

(71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
Wilmington Delaware 19898 (US)

(72) Inventor:
  • SUBRAMANIAN, Mumirpallam, Appaborai
    New Castle, DE 19720 (US)

(74) Representative: Jones, Alan John, et al 
CARPMAELS & RANSFORD 43 Bloomsbury Square
London, WC1A 2RA
London, WC1A 2RA (GB)

   


(54) IMPROVED PROCESS FOR MAKING 90 K SUPERCONDUCTORS