Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2009-09-21
2011-12-20
Phan, Thiem (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S613000, C029S619000, C029S860000, C029S874000, C029S878000
Reexamination Certificate
active
08079136
ABSTRACT:
A monolithic, multi-layer heating element forms the high temperature tip of a glow plug assembly. The heating element includes a conductive core which is surrounded by an insulator layer, which in turn supports a resistive layer. An optional conductive jacket can surround the resistive layer. These layered components are pre-formed in prior operations and then assembled one into the other to form a precursor structure. The precursor structure is transferred to a die, where it is compressed to form a so-called green part having dimensional attributes proportional to the finished heating element. The individual layers remain substantially intact, with some boundary layer mixing possible to enhance material-to-material bonding. The green part is sintered to bond to various materials together into an essentially solid mass. Various finishing operations may be required, following which the heating element is assembled to form a glow plug.
REFERENCES:
patent: 4490319 (1984-12-01), Lee et al.
patent: 4695759 (1987-09-01), Podiak
patent: 4923829 (1990-05-01), Yasumtomi et al.
patent: 5286802 (1994-02-01), Uesugi et al.
patent: 5304778 (1994-04-01), Dasgupta et al.
patent: 5948306 (1999-09-01), Konishi et al.
patent: 5993722 (1999-11-01), Radmacher
patent: 6143238 (2000-11-01), Konishi et al.
patent: 6156238 (2000-12-01), Wotting et al.
patent: 6274079 (2001-08-01), Lindemann et al.
patent: 6299958 (2001-10-01), St.Julien et al.
patent: 6309589 (2001-10-01), Knoll et al.
patent: 6396028 (2002-05-01), Radmacher
patent: 6563093 (2003-05-01), Lindemann et al.
patent: 6610964 (2003-08-01), Radmacher
patent: 6759631 (2004-07-01), Geissinger et al.
patent: 6777361 (2004-08-01), Aichele et al.
patent: 6881930 (2005-04-01), Yoshikawa et al.
patent: 7020952 (2006-04-01), Watanabe et al.
patent: 7160584 (2007-01-01), Goeb et al.
patent: 2004/0079745 (2004-04-01), Haluschka et al.
patent: 2005/0118346 (2005-06-01), Goeb et al.
patent: 2005/0145613 (2005-07-01), Goeb et al.
patent: 57012221 (1982-01-01), None
patent: 62000731 (1987-01-01), None
Robert Bosch GmbH “Auxillary Starting Devices” Automotive Handbook 4th Edition, pp. 58-59; 1993.
Champion Spark Plug Company. “Glow Plugs” Straight Talk About Spark Plugs, Glow Plugs, Igniters. A Technical and Engineering Guide. pp. 32-35; 1987.
Hoffman John W.
May James L.
Walker, Jr. William J.
Dickinson Wright PLLC
Federal-Mogul World Wide Inc.
Phan Thiem
Stearns Robert L.
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