Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01M
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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2250/00
Fuel cells for particular applications; Specific features of fuel cell system
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H01M2250/30
Fuel cells in portable systems, e.g. mobile phone, laptop
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