Electric heating – Heating devices – With power supply and voltage or current regulation or...
Reexamination Certificate
2007-09-18
2007-09-18
Paschall, Mark (Department: 3742)
Electric heating
Heating devices
With power supply and voltage or current regulation or...
C219S539000, C219S541000, C219S552000, C219S549000, C338S0220SD
Reexamination Certificate
active
11213201
ABSTRACT:
An improved PTC device and method of manufacturing is disclosed. In one embodiment, the device and method incorporates an improved metal-ceramic composite PTC material manufactured by: (a) heating a ceramic material to a sufficiently high temperature to induce the ceramic material's PTC properties; (b) grinding the ceramic PTC material into a powder; (c) mixing the ceramic PTC material powder with a metal material powder so as to produce a metal-ceramic composite material powder; and (d) sintering the composite material powder at a temperature between 600° and 950° C. In alternative embodiments, an improved multi-layer structure and method of manufacturing such a structure is disclosed. In various embodiments, a PTC device made in accordance with the improved multi-layer structure and method of manufacture may or may not incorporate the improved metal-ceramic composite PTC material disclosed herein, but may use conventional ceramic-based PTC materials.
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Chang Daniel H.
Li Xiang-Ming
Wang Liwu
Yang Xiaopeng
AEM, Inc.
Morrison & Foerster / LLP
Paschall Mark
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