(19)
(11)
EP 0 024 416 A1
(12)
(43)
Date of publication:
11.03.1981
Bulletin 1981/10
(21)
Application number:
80900477.0
(22)
Date of filing:
23.01.1980
(51)
International Patent Classification (IPC):
A62D
1/
02
( . )
B01F
3/
12
( . )
B01F
1/
00
( . )
(86)
International application number:
PCT/US1980/000111
(87)
International publication number:
WO 1980/001883
(
18.09.1980
Gazette 1980/21)
(84)
Designated Contracting States:
DE FR GB SE
(30)
Priority:
06.03.1979
US 19790017858
(71)
Applicant:
PHILADELPHIA SUBURBAN CORPORATION
Lionville, PN 19353 (US)
(72)
Inventor:
CHIESA, Peter J., Jr.
South San Francisco, CA 94080 (US)
(74)
Representative:
Bernard, Alan Peter, et al
F.J. CLEVELAND & COMPANY 40/43 Chancery Lane
London WC2A 1JQ
London WC2A 1JQ (GB)
(54)
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