| Patents for C21B 5 - Making pig-iron in the blast furnace (3,135) |
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| 09/12/1978 | US4113481 Green balls formed by agglomerating wet-collected fume produced in metallurgical furnaces |
| 08/22/1978 | US4108500 Process and equipment for effecting savings in compressed gases during injection of solids by means of pneumatic conveyors |
| 07/11/1978 | US4100031 Process for preparing blast furnace cokes |
| 06/27/1978 | US4097092 Disperser |
| 06/27/1978 | US4097028 Method of melting and apparatus therefor |
| 03/21/1978 | US4080196 Method of operating a vertical shaft furnace |
| 02/14/1978 | US4073641 Selective reduction of nickel ore with a low nickel content |
| 02/07/1978 | US4072504 Method of producing metal from metal oxides |
| 02/07/1978 | US4072502 Method apparatus for increasing blast gas temperature in a shaft furnace |
| 01/10/1978 | US4067700 High pressure steam, rapid depressurization |
| 01/03/1978 | US4066443 Olivine |
| 10/18/1977 | US4054640 Iron ore catalyst lumps |
| 09/27/1977 | US4050679 Method and apparatus for controlling the furnace top gas pressure of blast furnaces |
| 08/09/1977 | US4040817 Method for the reduction of iron ores in a shaft furnace, especially in a blast furnace with oil injection |
| 08/09/1977 | US4040789 Measuring nitrogen concentration |
| 06/21/1977 | US4030894 Stabilized fuel slurry |
| 04/26/1977 | US4019895 Method of reducing ore using a plasma burner |
| 03/22/1977 | US4013867 Polyphase arc heater system |
| 03/22/1977 | US4013454 Coproduction of iron with methanol and ammonia |
| 01/25/1977 | US4004916 Method for agglomerating wet-collected fume for use in metallurgical furnaces and agglomerates produced thereby |
| 01/25/1977 | US4004647 Load cell arrangement |
| 01/11/1977 | US4002466 Method of reducing ores |
| 01/04/1977 | US4001008 Method and apparatus for the reduction of ores, especially iron ores |
| 12/21/1976 | US3998606 Method and apparatus for manufacturing reducing gas |
| 07/27/1976 | US3971654 Smelting iron |
| 07/20/1976 | US3970290 Arrangement for feeding |
| 06/29/1976 | US3966457 Iron smelting |
| 06/29/1976 | US3966456 Reduction of iron oxides |
| 06/08/1976 | US3962128 Coal dust fuel distribution system and method of manufacturing activated carbon |
| 06/01/1976 | US3961032 Method for cleaning gases and vapors |
| 05/11/1976 | US3955963 Method of reducing ore |
| 04/20/1976 | US3951644 Charging with coke and limestone, combustion |
| 03/30/1976 | US3947234 Method of raising the temperature of reducing gas containing co component |
| 02/10/1976 | US3937449 Liquid-fuel atomization and injection device |
| 01/27/1976 | US3935002 Method of blast furnace operation utilizing selective recycling of peripheral gas stream |