(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