(19)

(11)

EP 1 971 738 A1

(12)

(43) Date of publication: 24.09.2008 Bulletin 2008/39 (21) Application number: 06847616.7 (22) Date of filing: 13.12.2006

(51) International Patent Classification (IPC):  E04H 9/04(2006.01) E04H 9/14(2006.01) (86) International application number: PCT/US2006/047569 (87) International publication number: WO 2007/078779 (12.07.2007 Gazette 2007/28)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 29.12.2005 US 321800 (71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY Wilmington, DE 19898 (US)	(72) Inventors: HANKS, Jeffrey Alan Midlothian, Virginia 23112 (US) KENNARD, Jeffrey Lee Hockessin, Delaware 19707-1807 (US) (74) Representative: Gritschneder, Martin  Abitz & Partner - Patentanwälte Hörselbergstrasse, 5 81628 München 81628 München (DE)