Electric heating – Inductive heating – Specific heating application
Reexamination Certificate
2005-09-06
2005-09-06
Hoang, Tu (Department: 3742)
Electric heating
Inductive heating
Specific heating application
C219S639000, C219S652000, C219S672000
Reexamination Certificate
active
06940056
ABSTRACT:
A method of induction heat treatment of articles having curved outer surfaces, such as differential housings. The method employs a semi-rectangular induction coil that is adapted to provide a plurality of lateral magnetic fields that are used to induce currents in, and thereby provide heat to, a portion of the curved section of the article. The method and induction coil are particularly adapted to provide an induction hardening heat treatment of a curved heat treatment portion of a differential housing. The differential housing was cast from nodular iron. The induction-hardening heat treatment comprised heating the heat treatment portion of the differential housing above the austenite transition temperature and quenching to below the martensite transformation temperature.
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Patent application (23 pages) and drawings (4 pages) for U.S. Appl. No. 10/643,362, filed Aug. 19, 2003, entitled “Induction Heat Treatment Method And Coil And Article Treated Thereby,” to Christofis et al.
Patent application (24 pages) and drawings (6 pages) for U.S. Appl. No. 10/643,363, filed Aug. 19, 2003, entitled “Induction Heat Treatment Method And Article Treated Thereby,” to Christofis et al.
Christofis Mark
Corless Rex R.
Kumashi Rajendra G.
Miller, Jr. William R.
Szalony Norman
Dickinson Wright PLLC
Hoang Tu
Visteon Global Technologies Inc.
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