Metal working – Method of mechanical manufacture – Structural member making
Reexamination Certificate
2011-04-19
2011-04-19
Banks, Derris H (Department: 3729)
Metal working
Method of mechanical manufacture
Structural member making
C148S592000, C148S593000, C148S597000, C148S606000, C148S607000, C420S038000
Reexamination Certificate
active
07926180
ABSTRACT:
A method for making gas and liquid storage tanks such as automotive fuel tanks includes providing two or more blanks of air hardenable martensitic stainless steel in the annealed condition. The steel blanks have a thickness in the range of 0.5-5.0 mm., and are formed utilizing stamping, forging, pressing, or roller forming techniques or the like into the form of a tank shell components. The shell components are hardened and assembled into a storage tank. The shell components are hardened by application of heat, preferably to between 950° C. and 1100° C. for standard air hardenable martensitic stainless steels. Thereafter, the automotive fuel tank is preferably cooled at a rate greater than 25° C. per minute to achieve a Rockwell C hardness of at least 39. The automotive fuel tank may undergo additional heat treating processes including high temperature or low temperature tempering processes which may incorporate electro-coating.
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Codd Danny
McCrink Edward J.
Banks Derris H
Duckworth David G.
Parvez Azm
Russo & Duckworth, LLP
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