Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 6400747 | Quadrilateral assembly for coherent jet lancing and post combustion in an electric arc furnace A quadrilateral assembly in an electric arc furnace wall for providing one or more coherent jets into the furnace and for providing preferably a plurality of post combustion oxidant streams into the furnace, preferably for forming a post combustion oxidan... | 06/04/2002 |
| 5890889 | Shaft furnace An improved hearth section for a shaft furnace may comprise a plurality of splines mounted to the side wall of the hearth section in spaced-apart circumferential positions so that each of the splines extends radially inward from the side-wall and into the... | 04/06/1999 |
| 5858059 | Method for injecting feed streams into a molten bath First and second feed streams are injected into a molten bath, thereby creating first and second jets. The first and second jets combine to form a substantially planar, or fan jet, region within the molten bath. The first and second feed streams can inclu... | 01/12/1999 |
| 5383649 | Device for introducing particulate material An introducing means for introducing particulate material into a molten metal, molten alloy or molten ceramic stream, or spray of droplets formed therefrom is disclosed. The introducing means has an annular introducing chamber defining an opening through ... | 01/24/1995 |
| 4844426 | Vertical shaft furnace for melting aluminum A vertical shaft furnace for and a method of efficiently melting aluminum and aluminum alloys substantially completely by convection is disclosed. The vertical shaft furnace has a generally cylindrical cross-section with a refractory liner and a cast refr... | 07/04/1989 |
| 4504311 | Process and apparatus for a direct formation of molten iron A process and apparatus are presented for the direct production of molten iron from iron oxide ores in a metallurgical vessel. The process and apparatus involve decarbonization by oxygen blowing of an existing iron melt which has a carbon content above 1%... | 03/12/1985 |
| 4496387 | Transition between batch preheating and liquefying stages apparatus A rotary batch preheating kiln feeding batch materials to a batch liquefying vessel is separated from the liquefying vessel by a transition section including duct means to direct exhaust gas from the liquefying vessel to the interior of the rotary kiln at... | 01/29/1985 |
| 4369955 | Cupola furnace system A cupola system for production of gray iron employs otherwise wasted heat to preheat fuel, pig iron, flux and compressed air fed into a melting furnace, by diversion of melting furnace exhaust-gases through a preheating furnace containing feeding conduits... | 01/25/1983 |
| 4362293 | Cupola A cupola comprises a shaft with burners located at the bottom part around the periphery thereof, the burners having nozzle ducts. The cupola further comprises a hearth and a refractory bed. The total outlet cross-sectional area (Σf) of the nozzle ducts i... | 12/07/1982 |
| 4326700 | Dual fuel burner for metal melting furnaces Disclosed is an improved high velocity dual fuel burner and a method for firing a vertical shaft metal melting furnace with gaseous or liquid fuel in which the burner nozzle is adapted to mix and ignite both types of fuels alternately or in combination by... | 04/27/1982 |
| 4243209 | Multiple level refractory hearth for vertical shaft metal melting furnaces Disclosed herein is a method and an apparatus for improving the efficiency of conventional vertical shaft metal melting and refining furnaces by novel refractory arrangements to form a multiple level hearth which will support pieces of metal that have rea... | 01/06/1981 |
| 4168968 | Steelmaking process A cold charge of steel scrap is melt cut and melted in an arc furnace provided with special oxygen-fuel burners by which rapid melting is promoted, the interior of the furnace being maintained under negative pressure by a fume evacuation and filtration me... | 09/25/1979 |
| 4114862 | Processes and installations for melting pig-iron in a cupola furnace The invention relates to an installation for melting pig-iron comprising a cupola furnace, a combustion chamber burning the waste gases leaving this cupola furnace. This installation comprises furthermore a heat exchanger between the flue gases leaving th... | 09/19/1978 |
| 4097028 | Method of melting and apparatus therefor A charge is admitted into a shaft furnace so as to form a charge column therein. The lower end of the column is melted with a flame and the charge moves downwardly by gravity as melting proceeds. The flame is generated by admitting one or more streams of ... | 06/27/1978 |
| 4057231 | Cupola furnace The invention relates to a process for automatically deslagging a cupola furnace and to an improved cupola furnace using this process. According to the invention the bottom of the crucible is permanently connected to atmosphere via a siphon sill whose level is... | 11/08/1977 |
| 4000885 | Cupola furnace waste gas recuperative system and method for operating same An improved cupola furnace waste gas recuperative system and method for collecting waste furnace gases, cleaning them for the purpose of safely burning same either in a recuperator-heat exchanger for preheating incoming furnace blast air or for other heat... | 01/04/1977 |
