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| Patents for F28D 21 - Heat-exchange apparatus not covered by any of the groups (2,512) |
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| 03/15/1977 | US4011904 Combination heat exchanger and blower | | 11/16/1976 | US3991821 Heat exchange system | | 11/09/1976 | US3990506 Heat exchanger | | 10/26/1976 | US3987761 Auxiliary heater for a gas-fired water heater | | 10/05/1976 | US3984504 Method and apparatus for preventing water hammer in high pressure steam injection water heaters | | 09/28/1976 | US3982525 Hot air furnace | | 09/21/1976 | US3981291 Heat transfer and conditioning unit | | 08/03/1976 | US3972203 Rotary heat exchanger | | 07/13/1976 | US3968835 Heat exchanger for oil deodorizing plant | | 03/30/1976 | US3946802 Method and apparatus for heat recovery | | 01/27/1976 | US3934798 Heat saving apparatus | | 01/06/1976 | US3930489 Heating system |
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