Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F28
HEAT EXCHANGE IN GENERAL
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F28D
HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
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21/00
Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
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F28D2021/0019
Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
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F28D2021/0024
for combustion apparatus, e.g. for boilers
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