(19)

(11)

EP 0 813 671 A1

(12)

(43) Date of publication: 29.12.1997 Bulletin 1997/52 (21) Application number: 95913497.0 (22) Date of filing: 07.03.1995

(51) International Patent Classification (IPC):  F24F 11/ 00( . ) (86) International application number: PCT/US1995/002397 (87) International publication number: WO 1996/027769 (12.09.1996 Gazette 1996/41)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (71) Applicants: Jefferson, Donald E. Silver Spring, MD 20904 (US) BERKELEY, Arnold David Potomac, MD 20854 (US)	(72) Inventors: Jefferson, Donald E. Silver Spring, MD 20904 (US) BERKELEY, Arnold David Potomac, MD 20854 (US) (74) Representative: KUHNEN, WACKER & PARTNER  Alois-Steinecker-Strasse 22 85354 Freising 85354 Freising (DE)