Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or...
Reexamination Certificate
2011-06-07
2011-06-07
Ruddock, Ula C (Department: 1729)
Chemistry: electrical current producing apparatus, product, and
Fuel cell, subcombination thereof, or method of making or...
C429S408000, C429S434000, C429S435000, C429S457000, C429S468000, C429S514000, C392S468000, C392S469000, C392S479000
Reexamination Certificate
active
07955740
ABSTRACT:
A fuel cell system that employs one or more PTC ceramic heaters that do not need to be self-regulated, and thus will not require various control components, such as temperature sensors. The PTC ceramic heaters include a ceramic material that is designed for a particular temperature depending on the particular application. An electrical current is applied to the ceramic heater that generates heat as long as the temperature of the ceramic heater is below the designed temperature. If the ceramic heater reaches the designed temperature, then the resistance of the ceramic material goes up, and the current through the ceramic material goes down, so that the heater does not provide significant heating. Therefore, it does not need to be regulated.
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Nettesheim Stefan
Winter Franz
Barrow Amanda
GM Global Technology Operations LLC
Miller John A.
Miller IP Group, PLC
Ruddock Ula C
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