(19)
(11) EP 0 990 058 A1

(12)

(43) Date of publication:
05.04.2000 Bulletin 2000/14

(21) Application number: 98930576.8

(22) Date of filing: 18.06.1998
(51) International Patent Classification (IPC)7C22F 1/05, C22F 1/057
(86) International application number:
PCT/CA9800/596
(87) International publication number:
WO 9859/086 (30.12.1998 Gazette 1998/52)
(84) Designated Contracting States:
DE FR GB

(30) Priority: 20.06.1997 US 50341 P

(71) Applicant: ALCAN INTERNATIONAL LIMITED
MontrealQuebec H3A 3G2 (CA)

(72) Inventors:
  • GUPTA, Alok, Kumar
    Kingston, Ontario K7M 1E2 (CA)
  • JEFFREY, Paul, William
    Kingston, Ontario K7M 5A6 (CA)
  • LLOYD, David, James
    Bath, Ontario K0H 1G0 (CA)
  • BURGER, Gene, Bruce
    Kingston, Ontario K7P 1C7 (CA)
  • EVANS, Daniel, Ronald
    Bath, Ontario K0H 1G0 (CA)
  • MAROIS, Pierre, Henry
    Kingston, Ontario K7M 4J5 (CA)

(74) Representative: Gaunt, Robert John 
Stevens, Hewlett & Perkins1 Serjeants' InnFleet Street
London EC4Y 1NT
London EC4Y 1NT (GB)

   


(54) PROCESS OF PRODUCING HEAT-TREATABLE ALUMINUM ALLOY SHEET