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| Patents for F27D 7 - Forming, maintaining, or circulating atmospheres in heating chambers (2,811) |
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| 06/07/1977 | US4028052 Tunnel furnace for the heat treatment of articles | | 05/17/1977 | US4024338 High temperature heat insulation | | 03/22/1977 | US4013279 Treatment furnace | | 01/04/1977 | US4000962 Method of heating up glass melting furnaces or the like | | 12/28/1976 | US3999982 Injecting sulfur dioxide | | 12/14/1976 | US3997299 Apparatus for producing protective gas | | 09/28/1976 | US3982889 Preheating system for aluminum remelt furnace | | 07/13/1976 | US3969069 Burner systems for ovens and methods of operating such systems | | 05/18/1976 | US3957521 Cement, fuels, combustion | | 03/09/1976 | US3942943 Gravity flow discrete article gas flow isolated thermal treatment device | | 02/17/1976 | US3939297 Stoker feed system |
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