| Patents for C21B 13 - Making spongy iron or liquid steel, by direct processes (6,991) |
|---|
| 02/28/1978 | US4076520 Method for continuous passivation of sponge iron material |
| 02/14/1978 | US4073642 Method for reducing material containing iron oxides |
| 02/07/1978 | US4072504 Method of producing metal from metal oxides |
| 01/24/1978 | US4070181 Method for reduction of finely divided metal oxide material |
| 01/24/1978 | US4070180 Process for the passivation of sponge iron utilizing reducing gases containing free oxygen |
| 01/17/1978 | US4069015 Method of inhibiting rusting of sponge iron |
| 01/10/1978 | US4067728 Method for gaseous reduction of metal ores |
| 12/13/1977 | US4062674 Iron or steelmaking process |
| 12/13/1977 | US4062673 Flash smelting of iron with production of hydrogen of hydrogenation quality |
| 12/13/1977 | US4062529 Apparatus for the direct reduction of iron ore to sponge iron |
| 12/06/1977 | US4061492 Method of ore reduction with an arc heater |
| 11/15/1977 | US4057978 Apparatus for cooling pellets |
| 11/01/1977 | US4056602 High temperature chemical reaction processes utilizing fluid-wall reactors |
| 10/18/1977 | US4054640 Iron ore catalyst lumps |
| 10/18/1977 | US4054444 Methane |
| 10/18/1977 | US4054443 Reducing iron oxide |
| 10/11/1977 | US4053301 Process for the direct production of steel |
| 10/04/1977 | US4052195 Method for melting iron-containing material |
| 09/20/1977 | US4049441 Method of extending the life of a catalyst in a process of producing metallic iron pellets |
| 09/20/1977 | US4049440 Method for producing metallic iron pellets |
| 09/13/1977 | US4047935 Process for direct-reduction of iron-ore employing nuclear reactor-powdered catalytic reformer |
| 09/06/1977 | US4046557 Method for producing metallic iron particles |
| 09/06/1977 | US4046556 Direct gaseous reduction of oxidic metal ores with dual temperature cooling of the reduced product |
| 09/06/1977 | US4046555 Method of direct reduction of iron ore |
| 08/30/1977 | US4045214 From fine-grained iron ores |
| 08/16/1977 | US4042375 Roasting process for the direct reduction of ores |
| 08/16/1977 | US4042226 Method and apparatus for producing metallic iron pellets |
| 08/09/1977 | US4040816 Process for the production of sponge iron |
| 07/05/1977 | US4033559 Apparatus for continuous passivation of sponge iron material |
| 06/28/1977 | US4032352 Binder composition |
| 06/28/1977 | US4032123 Shaft furnace for direct reduction of ores |
| 06/28/1977 | US4032121 Recycling hot exhaust gases to heat first hearth furnace |
| 06/28/1977 | US4032120 Apparatus for direct reduction of sulfur-containing iron ore |
| 06/21/1977 | US4030913 Nitro compounds |
| 06/14/1977 | US4029496 Process for the reduction of iron mineral |
| 05/31/1977 | US4027095 Hermetically sealed arc furnace |
| 05/17/1977 | US4023963 Processing zones |
| 04/26/1977 | US4019895 Method of reducing ore using a plasma burner |
| 04/26/1977 | US4019724 Apparatus for the direct reduction of iron ores |
| 04/12/1977 | US4017305 Process for heat hardening |
| 03/29/1977 | US4014682 Process for the production of elemental phosphorus and iron from phosphate rock |
| 03/22/1977 | US4013867 Polyphase arc heater system |
| 03/15/1977 | US4012226 Process for steel production |
| 02/15/1977 | US4008074 With oxygen and carbonaceous dust |
| 02/08/1977 | US4007034 Method for making steel |
| 02/01/1977 | US4005857 Means for withdrawing sponge iron from retorts |
| 01/25/1977 | US4004918 Kneading sludge cakes, binders, reduction |
| 01/11/1977 | US4002465 Process for continuously heating and melting prereduced iron ores |
| 01/11/1977 | US4002422 Packed bed heat exchanger |
| 01/04/1977 | US4001010 Method for processing reduced iron |
| 01/04/1977 | US4001008 Method and apparatus for the reduction of ores, especially iron ores |
| 12/14/1976 | US3997333 Process for the reduction of complex metallic ores |
| 11/23/1976 | US3993473 Method of reducing iron oxide |
| 11/23/1976 | US3993472 Heating, steaming |
| 11/23/1976 | US3993471 Roasting powdered mineral ore, anthracite and binder |
| 11/16/1976 | US3992193 Metal oxides, quenching |
| 11/16/1976 | US3991987 Rotary kiln and hearth furnace |
| 11/02/1976 | US3989510 Manufacture of titanium chloride and metallic iron from titaniferous materials containing iron oxides |
| 10/12/1976 | US3985548 Using carbon monoxide |
| 10/12/1976 | US3985547 Iron ore reduction in multiple fluidized beds |
| 10/12/1976 | US3985544 Method for simultaneous combined production of electrical energy and crude iron |
| 10/05/1976 | US3984231 Process for the two-stage reduction of iron ore in a rotary kiln |
| 08/24/1976 | US3976472 Method and an electrically heated device for producing molten metal from powders or lumps of metal oxides |
| 08/17/1976 | US3975186 Method of making iron powder |
| 08/17/1976 | US3975182 Iron oxide |
| 08/03/1976 | US3972411 Method of feedig green pellets onto grate of pretreatment furnace in the production of reduced pellets |
| 07/27/1976 | US3971549 Process and apparatus for treating and transferring metal in the liquid state |
| 06/22/1976 | US3964898 Process for batch production of sponge iron |
| 06/22/1976 | US3964897 Method and arrangement for melting charges, particularly for use in the production of steel |
| 06/15/1976 | US3963483 Direct reduction steelmaking process |
| 05/18/1976 | US3957486 Method of reducing iron ore |
| 05/11/1976 | US3955963 Method of reducing ore |
| 05/04/1976 | US3954444 Process for the direct reduction of iron ores |
| 04/27/1976 | US3953196 By carbonaceous material in a shaft furnace |
| 04/06/1976 | US3948646 Method of direct reduction of iron ores |
| 04/06/1976 | US3948645 Method of carrying out heat-requiring chemical and/or physical processes in a fluidized bed |
| 04/06/1976 | US3948644 Steel making vessel with dust recycling method and means |
| 04/06/1976 | US3948641 Apparatus for the continuous production of steel from ore |
| 04/06/1976 | US3948640 Or physical processes |
| 03/30/1976 | US3947621 Furnace and method for reducing metal oxides to molten metal |
| 03/30/1976 | US3947267 Process for making stainless steel |
| 03/30/1976 | US3946949 Nozzle for rotary kiln |
| 03/23/1976 | US3945624 Reduction kiln having a controllable distribution system |
| 03/16/1976 | US3944413 Direct reduction of metallic oxides |
| 03/09/1976 | US3942978 Metallurgical method |
| 03/02/1976 | US3941583 Coke matrix skin |
| 03/02/1976 | US3941359 Apparatus for direct reduction of iron oxides |
| 02/24/1976 | US3940551 Apparatus and method for the melt reduction of iron oxides |
| 02/03/1976 | US3936296 Integrated fluidized reduction and melting of iron ores |
| 01/27/1976 | US3934863 Apparatus for refining molten metal and molten metal refining process |
| 01/13/1976 | US3932173 Inductially heated gas lift pump action method for melt reduction |