Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Reexamination Certificate
2005-12-29
2009-10-27
Phan, Thiem (Department: 3729)
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
C029S611000, C029S613000, C029S619000, C029S860000, C123S14500A, C123S14500A, C219S267000, C219S270000, C219S544000
Reexamination Certificate
active
07607206
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.
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Hoffman John W.
May Jim
Walker, Jr. William J.
Dickinson Wright PLLC
Federal - Mogul World Wide, Inc.
Phan Thiem
Stearns Robert L.
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