| Patents for F27B 3 - Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces (6,383) |
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| 07/30/1991 | US5035402 Furnaces |
| 07/25/1991 | WO1991010872A1 Collecting pit for receiving molten metal |
| 07/23/1991 | US5033958 Burner for a hot-blast furnace |
| 07/17/1991 | EP0436793A2 Oxygen-fuel burner |
| 07/17/1991 | EP0436718A1 Method of charging ore in melt-reduction |
| 07/09/1991 | US5030274 Method for recovering metallics and non-metallics from spent catalysts |
| 07/09/1991 | US5030273 Furnace-plasma arc torch-supervisory control system for recovery of free aluminum from aluminum dross |
| 07/09/1991 | US5029821 Injection of halogen, sampling, detection |
| 07/02/1991 | US5028248 Method of melting materials and apparatus therefor |
| 06/26/1991 | CN2079728U Combined quick-mounting forging stove |
| 06/26/1991 | CN1052585A Direct-arc electric furnace fed with controlled current and method to feed direct-arc furnace with controlled current |
| 06/25/1991 | US5026030 Melting and holding furnace |
| 06/20/1991 | DE4034606A1 Paper sheet alignment feed - has roller spindles in elongated holes in aligning straight edge |
| 06/13/1991 | DE3940558A1 Arc melting furnace |
| 06/05/1991 | EP0429978A1 Method of and apparatus for continuously discharging molten metal and slag |
| 06/05/1991 | EP0429774A1 Direct-arc electric furnace fed with controlled current and method to feed a direct-arc furnace with controlled current |
| 05/29/1991 | CN2077974U Charging basket device of electric-arc furance loading |
| 05/23/1991 | DE3922131A1 Electric furnace power supply control |
| 05/22/1991 | EP0428363A1 Apparatus for holding and refining of molten aluminium |
| 05/15/1991 | EP0427230A2 Hearth arrangement for melting furnace |
| 05/14/1991 | US5015178 Melting furnace |
| 05/08/1991 | CN2076662U Low-voltage direct heating tube type resistance furnace |
| 05/02/1991 | EP0424818A1 Furnace and heating unit therefor |
| 04/30/1991 | US5012488 Crucible for inductive heating |
| 04/24/1991 | CN2075766U Heating stove for plastic painting production line on metal |
| 04/17/1991 | EP0423003A1 Electrical connecting device to be placed on the wall of a metallurgical vessel and in contact with a molten metal |
| 04/16/1991 | CA1282910C Pasty gasket for producing a leakproof seal between surfaces which are subjected to heat and which have to be joined |
| 04/15/1991 | WO1991005883A1 Melting apparatus of cutting scrap |
| 04/10/1991 | EP0395692A4 Low temperature kiln |
| 04/10/1991 | EP0271578B1 Method for meltin metal in an induction plasma furnace |
| 04/09/1991 | US5005635 Refractory elements for the construction of heat regenerators |
| 04/03/1991 | EP0420776A1 Process and installation for charging of a furnace with materials and preheating of the same |
| 03/29/1991 | CA2026408A1 Method and apparatus for loading an oven with materials, and for preheating said materials |
| 03/27/1991 | EP0418656A1 Process and installation for intermittant simultaneous addition of gases and fine-grained solids into a melt |
| 03/27/1991 | EP0418481A2 Process for smelting a metallic charge |
| 03/27/1991 | CN2074001U Ceramic supporting device of horizontal toughening furnace heater |
| 03/21/1991 | CA2024938A1 Process and apparatus for at least at times simultaneously supplying a molten metal with a gas and fine-grain solid materials |
| 03/20/1991 | CN2073572U Micro-oxidation infrared energy-saving resistance furnace |
| 03/20/1991 | CN2073571U Forge furnace |
| 03/19/1991 | US5000425 Method of preheating scrap |
| 03/13/1991 | CN2073099U Resistance furnace with variable power and high efficiency energy-saving box |
| 03/12/1991 | US4998710 Apparatus for holding and refining of molten aluminum |
| 03/12/1991 | CA1281355C Floor of electrically heated melting furnace, particularly a direct current furnace |
| 03/06/1991 | EP0415038A1 Tubewall for a heatreactionroom |
| 03/06/1991 | CN2072667U Arc furnace electrode fixture with graphite lining board |
| 03/06/1991 | CN2072666U Concentration of beam type large-current water-cooled cable device |
| 03/06/1991 | CN1049714A Direct-current electric-arc furnace |
| 03/05/1991 | US4997474 Reduction of silicon dioxide with silicon carbide |
| 02/27/1991 | EP0413970A1 Direct current arc furnace |
| 02/22/1991 | CA2023041A1 Direct-current electric-arc furnace |
| 02/19/1991 | US4995051 Smelting furnace and method for feeding material to be processed therein |
| 02/12/1991 | CA1279995C Recovery of metals from their alloys with lead |
| 02/06/1991 | CN2070892U Power changeable case type electric resistance stove |
| 02/06/1991 | CN1049053A Rotation center dust-collecting method and its high-temp dust-collecting hood |
| 02/05/1991 | US4989841 Metal continuously melting and retaining furnace |
| 01/30/1991 | CN1048919A Drying apparatus by using the waste heat of cupola furnace |
| 01/30/1991 | CN1048918A Heat treating stove by using waste heat of cupola furnace |
| 01/23/1991 | CN2069994U Energy-saving efficient medium temperature electric resistance furnace |
| 01/23/1991 | CN1048750A Dc electric-are furnace with arc-controlling magnetic mirror |
| 01/22/1991 | US4986847 Efficient supplying |
| 01/22/1991 | US4986748 Wide range oxy-fuel burner and furnace operation |
| 01/16/1991 | EP0407717A2 Method for the electrothermal production of yellow phosphorus |
| 01/16/1991 | EP0407664A1 Melting and holding furnace |
| 01/10/1991 | DE3921807A1 Verfahren und vorrichtung zum beheizen eines metallurgischen ofens Method and apparatus for heating a metallurgical furnace |
| 01/09/1991 | CN1048449A Method of low temp. infrared radiation and compound radiation heating-furnace |
| 01/08/1991 | US4982934 Reheating, holding and accumulation furnace for steelworks products |
| 01/06/1991 | CA2012238A1 Furnace enclosure having a clear viewpath |
| 01/04/1991 | WO1991000366A1 Process and device for heating a metallurgical furnace |
| 01/04/1991 | CA2063711A1 Method and apparatus for heating a metallurgical furnace |
| 01/03/1991 | DE4020612A1 Low pressure melting furnace - uses compressed gas to drive molten metal into mould |
| 01/01/1991 | US4982411 Wall electrode for direct current powered electric arc furnace |
| 01/01/1991 | US4981285 Gas-fired steelmelting apparatus |
| 12/19/1990 | EP0403413A1 Procedure and device for measuring the instability of an arc in an electric furnace for the treatment of liquid metals |
| 12/19/1990 | EP0403035A2 Method for attaining a temperature in a metal bath |
| 12/18/1990 | CA1278008C Electric arc melting apparatus and associated method |
| 12/15/1990 | CA2019008A1 Process and apparatus for measuring the instability of an arc in an electric furnace used for molten metal treatment |
| 12/13/1990 | WO1990015163A1 Closed remelting furnace with a plurality of horizontally mobile bottom elements |
| 12/11/1990 | CA1277486C Method and installation for the maintenance of an oven's lining |
| 12/05/1990 | EP0401172A1 A heating mantle with a porous radiation wall |
| 12/05/1990 | EP0400214A1 Metal melting and holding furnace |
| 12/05/1990 | CN2066961U Single electrode dc submerged-arc electric arc furnace |
| 12/04/1990 | US4974817 Metal melting and holding furnace |
| 11/28/1990 | CN2066567U Single passage type half gas energy-saving heat conducting oil stove |
| 11/22/1990 | EP0398001A1 Burner for cowper |
| 11/14/1990 | CN2065749U Fire-tube type heat-tube heaitng furnace |
| 11/13/1990 | US4969940 Apparatus and method for making mineral wool from coal-ash |
| 11/07/1990 | EP0395692A1 Low temperature kiln. |
| 10/23/1990 | US4965813 Combustion aiding apparatus for steel-making electric-arc-furnace |
| 10/18/1990 | WO1990010086A3 Melting aggregate with shaft for preheating charged materials |
| 10/11/1990 | DE3911164A1 Process for improving the heat utilisation in the glass melt, and brick and tank furnace for use in this process |
| 10/10/1990 | CN2063618U Box electric resistance furnace |
| 10/02/1990 | CA1274869A1 Hot gunning robot for furnace lining |
| 09/26/1990 | EP0273975B1 Induction plasma furnace |
| 09/26/1990 | CN2062812U Arc controlled dc electric arc furnace with magnetic mirror |
| 09/26/1990 | CN1045642A Smelting plant with shaft-like material preheater |
| 09/26/1990 | CN1009759B Electrical connection device intended to be placed through the wall of a direct-current metallurgical furnace |
| 09/26/1990 | CN1009758B Cold hearth melting configuration and method |
| 09/26/1990 | CN1009756B Circular kiln furnace |
| 09/18/1990 | US4957431 Heating mantle with a porous radiation wall |
| 09/18/1990 | CA1274085A1 Method and device for pre-heating waste metal for furnaces |