Nested or concentric members define annular air draft passage and heating or cooling conduit

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Patents Grantslast 30 patents

Information Patent Grant
3195623
- Patent number 3,195,623
- Issue date Jul 20, 1965
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
3022982
- Patent number 3,022,982
- Issue date Feb 27, 1962
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
1639941
- Patent number 1,639,941
- Issue date Aug 23, 1927
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
1325276
- Patent number 1,325,276
- Issue date Dec 16, 1919
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
736649
- Patent number 736,649
- Issue date Aug 18, 1903
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
732454
- Patent number 732,454
- Issue date Jun 30, 1903
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
559307
- Patent number 559,307
- Issue date Apr 28, 1896
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
547677
- Patent number 547,677
- Issue date Oct 8, 1895
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
316772
- Patent number 316,772
- Issue date Apr 28, 1885
- F24 - HEATING RANGES VENTILATING