including air draft passage for heating ambient air

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Patents Grantslast 30 patents

Information Patent Grant
2236750
- Patent number 2,236,750
- Issue date Apr 1, 1941
- F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
Information Patent Grant
2039254
- Patent number 2,039,254
- Issue date Apr 28, 1936
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
1561461
- Patent number 1,561,461
- Issue date Nov 17, 1925
- F24 - HEATING RANGES VENTILATING
Information Patent Grant
607706
- Patent number 607,706
- Issue date Jul 19, 1898
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
312678
- Patent number 312,678
- Issue date Feb 24, 1885
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
271758
- Patent number 271,758
- Issue date Feb 6, 1883
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
256345
- Patent number 256,345
- Issue date Apr 11, 1882
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
221750
- Patent number 221,750
- Issue date Nov 18, 1879
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
162496
- Patent number 162,496
- Issue date Apr 27, 1875
- F28 - HEAT EXCHANGE IN GENERAL
Information Patent Grant
91940
- Patent number 91,940
- Issue date Jun 29, 1869
- F28 - HEAT EXCHANGE IN GENERAL