Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2008-06-10
2008-06-10
Kim, Vickie (Department: 4116)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S639000
Reexamination Certificate
active
07384489
ABSTRACT:
A method for heat treating metallic strips inside a heat treatment chamber at a pressure greater than atmospheric pressure including passing the strips through at least one heating zone of the chamber and moving the strip through at least one cooling zone of the chamber. A first protective gas atmosphere containing nitrogen and hydrogen and/or helium is established in all but at least one cooling zone. The at least one cooling zone has a second protective atmosphere containing nitrogen and a second amount of hydrogen, the second amount of hydrogen is greater than the first amount. Nitrogen is introduced into the chamber, and a protective gas containing a third hydrogen content greater than the second hydrogen content is injected into the cooling zone, producing a gas exchange between one zone of the chamber having the first protective atmosphere and the cooling zone, and controlling the flow of introduction and injection.
REFERENCES:
patent: 4966632 (1990-10-01), Vinckx et al.
patent: 5137586 (1992-08-01), Klink
patent: 5798007 (1998-08-01), Boyer et al.
patent: 5885382 (1999-03-01), Sakurai et al.
patent: 6224692 (2001-05-01), Cantacuzene
patent: 0379104 (1990-07-01), None
patent: 0815268 (1998-01-01), None
patent: 0979879 (2000-02-01), None
patent: 0795616 (2001-11-01), None
patent: 2375334 (1978-07-01), None
patent: EP 0075438 (1983-03-01), None
patent: 07-233420 (1995-09-01), None
patent: 07 233420 (1995-09-01), None
patent: 11117024 (1999-04-01), None
patent: 2002003953 (2002-01-01), None
Published Unexamined Patent Application, Publication No. Sho 55-1969, Method of Cooling Steel Strip with Gas Jet, Jun. 1974, pp. 1-8, 37-42.
Crutzen Jean-Pierre
Dosogne Edgard
Raick Jean-Marc
Renard Michel
Browdy and Neimark
Drever International S.A.
Kim Vickie
Shevin Mark L
LandOfFree
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