Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or... – Process or means for producing – recycling – or treating...
Reexamination Certificate
2011-08-16
2011-08-16
Ruddock, Ula C (Department: 1729)
Chemistry: electrical current producing apparatus, product, and
Fuel cell, subcombination thereof, or method of making or...
Process or means for producing, recycling, or treating...
C429S427000, C429S428000, C429S448000, C429S449000, C429S505000
Reexamination Certificate
active
07998628
ABSTRACT:
In a fuel cell system (10), an anode exhaust gas discharge pipe (50) is full of hydrogen at the start of operation of a fuel cell (20). As time passes when the fuel cell (20) is operating, the concentration of impurities within the anode exhaust gas discharge pipe (50) increases. When the hydrogen concentration is less than a reference concentration for opening a valve, an upstream cut-off valve (61) closes and a downstream cut off valve (62) opens. As a result, the impurity concentration in the anode gas discharge pipe (50) quickly drops and is restored to the level that it was at the start of operation of the fuel cell (20). This sudden drop in the impurity concentration is caused by a pressure difference between the pressure in the anode exhaust gas pipe (50) and the pressure of the outside air, and the concentration gradient.
REFERENCES:
patent: 6171718 (2001-01-01), Murach et al.
patent: 6426158 (2002-07-01), Pratt et al.
patent: 6436562 (2002-08-01), DuBose
patent: 6558827 (2003-05-01), Reiser
patent: 7718286 (2010-05-01), Fujita
patent: 2001/0049035 (2001-12-01), Haltiner et al.
patent: 2003/0049503 (2003-03-01), Ballantine et al.
patent: 2003/0157383 (2003-08-01), Takahashi
patent: 2004/0096721 (2004-05-01), Ohlsen et al.
patent: 2005/0214617 (2005-09-01), Chapman et al.
patent: 2006/0240309 (2006-10-01), Dehne
patent: 2007/0009772 (2007-01-01), Iio
patent: 2 293 898 (2000-07-01), None
patent: 2 146 933 (1973-03-01), None
patent: 1018774 (1999-12-01), None
patent: 1 018 774 (2000-07-01), None
patent: A 9-312167 (1997-12-01), None
patent: A 2003-77506 (2003-03-01), None
patent: WO 03/010841 (2003-02-01), None
patent: PCT/IB2004/003365 (2004-10-01), None
Oct. 20, 2010 Office Action issued in German Patent Application No. 11 2008 000 528.1-45 (with translation).
Barrow Amanda
Oliff & Berridg,e PLC
Ruddock Ula C
Toyota Jidosha & Kabushiki Kaisha
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