(19)
(11) EP 1 644 540 A2

(12)

(43) Date of publication:
12.04.2006 Bulletin 2006/15

(21) Application number: 04754496.0

(22) Date of filing: 04.06.2004
(51) International Patent Classification (IPC): 
C21B 3/00(1968.09)
(86) International application number:
PCT/US2004/017898
(87) International publication number:
WO 2004/108970 (16.12.2004 Gazette 2004/51)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 05.06.2003 US 476005 P
31.12.2003 US 533855 P
03.06.2004 US 860185

(71) Applicant: Questek Innovations LLC
Evanston, IL 60201 (US)

(72) Inventors:
  • TUFTS, Brian, E.
    Wilmette, IL 60091 (US)
  • KUEHMANN, Charles, J.
    Deerfield, IL 60015 (US)
  • OLSON, Gregory, B.
    Riverwoods, IL 60015 (US)
  • JOU, Herng-Jeng
    Wilmette, IL 60091 (US)

(74) Representative: Mohun, Stephen John 
Haseltine Lake & Co., Imperial House, 15-19 Kingsway
London WC2B 6UD
London WC2B 6UD (GB)

   


(54) NANO-PRECIPITATION STRENGTHENED ULTRA-HIGH STRENGTH CORROSION RESISTANT STRUCTURAL STEELS