(19)

(11)

EP 2 422 375 A2

(12)

(88) Date of publication A3: 03.02.2011 (43) Date of publication: 29.02.2012 Bulletin 2012/09 (21) Application number: 10767761.9 (22) Date of filing: 22.04.2010

(51) International Patent Classification (IPC):  H01L 31/042(2006.01) H01L 31/18(2006.01) (86) International application number: PCT/US2010/032041 (87) International publication number: WO 2010/124078 (28.10.2010 Gazette 2010/43)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (30) Priority: 24.04.2009 US 172669 P (71) Applicant: Peumans, Peter Sunnyvale, CA 94087 (US)	(72) Inventors: PADMAKUMAR, Bala Mountain View CA 94040 (US) HUNTER, James Compbell CA 95008 (US) FITZGERALD, Alissa, M. San Francisco CA 94118 (US) HUIGENS, Brent, M. Burlingame CA 94010 (US) WHITE, Carolyn, D. San Francisco CA 94110 (US) (74) Representative: Specht, Peter et al Loesenbeck - Specht - Dantz Patent- und Rechtsanwälte Am Zwinger 2 33602 Bielefeld 33602 Bielefeld (DE)