Version: 2024.01
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CPC | COOPERATIVE PATENT CLASSIFICATION | |||
F24V | COLLECTION, PRODUCTION OR USE OF HEAT NOT OTHERWISE PROVIDED FOR [2018-05] |
F24V 30/00 | Apparatus or devices using heat produced by exothermal chemical reactions other than combustion [2018-05] |
F24V 40/00 | Production or use of heat resulting from internal friction of moving fluids or from friction between fluids and moving bodies [2018-05] |
F24V 40/10 | . | the fluid passing through restriction means [2018-05] |
F24V 50/00 | Use of heat from natural sources, e.g. from the sea [2018-05] |
F24V 99/00 | Subject matter not provided for in other main groups of this subclass [2018-05] |