(19)

(11)

EP 0 183 709 A1

(12)

(43) Date of publication: 11.06.1986 Bulletin 1986/24 (21) Application number: 85901722.0 (22) Date of filing: 11.03.1985

(51) International Patent Classification (IPC):  F24F 3/ 16( . ) F24F 9/ 00( . ) (86) International application number: PCT/US1985/000387 (87) International publication number: WO 1985/004240 (26.09.1985 Gazette 1985/21)

(84) Designated Contracting States: AT BE CH DE FR GB LI LU NL SE (30) Priority: 12.03.1984 US 19840588385 08.03.1985 US 19850709454 (71) Applicants: FOSTER, Leo J. Phoenixville, PA 19460 (US) CALDERBANK, Francis J. Bel Air, MD 21014 (US)	(72) Inventors: FOSTER, Leo J. Phoenixville, PA 19460 (US) CALDERBANK, Francis J. Bel Air, MD 21014 (US)