| Patents for F27B 3 - Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces (6,383) |
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| 10/10/1978 | US4119792 Melting furnace |
| 10/10/1978 | CA1040109A1 Filter screen with acoustic pressure wave transducer |
| 10/03/1978 | CA1039500A1 Rotary kiln and hearth furnace |
| 09/26/1978 | CA1039066A1 Heating process and apparatus using oxygen |
| 09/19/1978 | US4115108 Matte smelting |
| 09/12/1978 | CA1038432A1 Resistance heating mound furnace |
| 08/29/1978 | US4110547 Method of steelmaking with direct current |
| 08/29/1978 | US4110546 DC arc furnace having a rotating arc |
| 08/22/1978 | CA1036813A1 Apparatus for the production of metals by a smelting metallurgical process |
| 07/04/1978 | US4097978 DC Arc furnace hearth electrode installation |
| 06/27/1978 | US4097679 Side wall of the ultra high power electric arc furnaces for steelmaking |
| 06/27/1978 | US4097032 Forehearth with weir, particularly for use in a basalt smelting furnace |
| 06/06/1978 | US4093816 Furnace heating apparatus |
| 05/23/1978 | US4091228 Water cooled shell for electric arc furnaces |
| 05/09/1978 | US4088824 Electric furnace station noise and smoke pollution control system |
| 05/09/1978 | US4088180 Regenerator flow control |
| 04/11/1978 | US4083677 Method and apparatus for heating a furnace chamber |
| 03/28/1978 | US4081178 Apparatus for collection of tapping gases from electric smelting furnaces |
| 03/21/1978 | US4080511 Direct current electric arc furnace |
| 03/21/1978 | US4080509 Arc furnace, melting, smelting, alloying, silicon, beryllium, copper, carbides |
| 03/21/1978 | US4079920 Metal-melting furnace |
| 03/14/1978 | US4079185 Direct current arcing electrodes |
| 02/28/1978 | US4075812 Refractory checkerwork |
| 02/14/1978 | US4073243 Industrial furnace roof assembly and components thereof |
| 12/27/1977 | US4065634 Skull furnace for melting highly reactive metals under vacuum or neutral atmosphere |
| 12/20/1977 | US4063931 Refractory coating, corrosion resistance |
| 11/29/1977 | US4060409 Mechanically stirred furnace for pyrometallurgical operations and processes |
| 11/29/1977 | US4060408 Melting process |
| 10/25/1977 | US4055334 Recycle burner system |
| 09/13/1977 | US4047560 Regenerator flow control |
| 08/30/1977 | US4045211 Method for increasing radiant heat transfer from hot gases |
| 07/26/1977 | US4038483 Means for direct current arc furnaces |
| 07/19/1977 | US4037043 Extended arc furnace and process for melting particulate charge therein |
| 07/05/1977 | US4033819 Derivatives of diphtheria toxin, process for preparing them and agents containing them |
| 07/05/1977 | US4033562 Furnace for melting solid ferrous pieces |
| 06/21/1977 | US4031308 Direct current arc furnace hearth connection installation |
| 06/07/1977 | US4028048 Scrap metal preheating apparatus and method |
| 06/07/1977 | US4027862 Metal melting furnace with alternate heating systems |
| 04/19/1977 | US4019130 Method for measuring wear of cooling cell assembly |
| 04/05/1977 | US4016355 Device in direct current arc furnaces |
| 04/05/1977 | US4015834 Lifting bail for modular divisible metallurgical furnace shells |
| 03/08/1977 | US4010935 High efficiency aluminum scrap melter and process therefor |
| 03/01/1977 | US4010313 Device for effecting a gastight closure |
| 02/22/1977 | US4008884 Stirring molten metal |
| 02/01/1977 | US4006284 Extended arc furnace and process for melting particulate charge therein |
| 01/25/1977 | US4005252 Apparatus for gas collection in open electric smelting furnaces |
| 01/04/1977 | US4001488 Apparatus for feeding charge to an electric smelting furnace |
| 01/04/1977 | US4000962 Method of heating up glass melting furnaces or the like |
| 12/21/1976 | US3999000 Self-commutating DC arc furnace having starting electrode and method of its operation |
| 12/14/1976 | US3997712 Electric arc furnace |
| 12/07/1976 | US3996412 Aluminum melting furnace |
| 12/07/1976 | US3996044 Electro-pyrolytic upright shaft type solid refuse disposal and conversion process |
| 11/23/1976 | US3993237 Method for providing high-temperature internal insulation |
| 11/16/1976 | US3991987 Rotary kiln and hearth furnace |
| 11/09/1976 | US3990686 Furnace for producing steel from scrap steel and the like |
| 10/26/1976 | US3988525 Direct current arc furnace with charging means |
| 10/19/1976 | US3987237 Electric furnace wall construction |
| 10/12/1976 | US3985945 Direct-current arc furnace |
| 10/05/1976 | US3984617 Electric arc furnace |
| 10/05/1976 | US3984613 Electric furnace with tiltable and removable hearth |
| 09/28/1976 | US3983309 Primary electrode arrangement for high temperature melting furnace |
| 09/14/1976 | US3980801 Tilt and swing lock mechanism for electric furnace |
| 08/31/1976 | US3977824 Travelling hearth housing |
| 08/24/1976 | US3976829 Collector apparatus for gaseous reaction products |
| 08/17/1976 | US3975576 Rotatable furnace pot including stoking means |
| 08/17/1976 | US3975575 Rotatable furnace pot for smelting furnaces |
| 08/03/1976 | US3973076 Furnace for melting highly corrosive slag |
| 07/13/1976 | US3969069 Burner systems for ovens and methods of operating such systems |
| 06/29/1976 | US3967048 Dual ring supported roof for electric arc furnace |
| 06/29/1976 | US3967046 Apparatus and method for increasing furnace life in an electric furnace for thermoplastic materials |
| 06/22/1976 | US3964898 Process for batch production of sponge iron |
| 06/08/1976 | US3962528 Furnace skewback support with buckstay pivot |
| 04/27/1976 | US3953009 Metallurgical vessel |
| 04/20/1976 | US3952140 Modular divisible barrel-shaped shell for metallurgical furnaces |
| 04/13/1976 | US3950602 Furnace installation operated by direct electrical heating according to the resistance principle in particular for preparation of silicon carbide |
| 04/06/1976 | US3949151 Arc furnaces |
| 03/23/1976 | US3945820 Refining |
| 02/24/1976 | US3940552 Water-cooled panel for arc furnace |
| 02/17/1976 | US3939297 Stoker feed system |
| 02/17/1976 | US3939028 Protection of carbon articles |
| 02/17/1976 | US3938788 Apparatus for the production of metals by a smelting metallurgical process |
| 02/03/1976 | US3936588 Control system for electrical furnaces |
| 01/06/1976 | US3930488 Heating panel for use in explosion-prone furnaces |