(19)

(11)

EP 1 230 683 A2

(12)

(88) Date of publication A3: 25.10.2001 (43) Date of publication: 14.08.2002 Bulletin 2002/33 (21) Application number: 00992226.1 (22) Date of filing: 27.10.2000

(51) International Patent Classification (IPC)7: H01L 27/15, H01L 31/12, H01L 33/00, H01L 31/06, G02B 27/00, H04B 10/00 (86) International application number: PCT/US0041/694 (87) International publication number: WO 0139/515 (31.05.2001 Gazette 2001/22)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 28.10.1999 US 162314 P (71) Applicant: Powersmart, Inc. Needham, MA 02494 (US)	(72) Inventor: GHASEMINEJAD, Parviz Framingham, MA 01701 (US) (74) Representative: Feldkamp, Rainer, Dipl.-Ing. et al PatentanwälteWallach, Koch, Dr. Haibach, Feldkamp,Garmischer Strasse 4 80339 München 80339 München (DE)