Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7993574 | Board lined furnace with side immersion heating elements A holding furnace for holding a molten metal includes a housing having an interior chamber for holding the molten metal. An insulating board structure is placed into the chamber along at least a side portion of the housing. The insulating board structure contains he... | 08/09/2011 |
| 7858022 | Crucible-type continuous melting furnace A crucible-type continuous melting furnace includes a preheating tower for storing the material to be melted, and an exhaust port on the top thereof; a melting crucible furnace disposed below the preheating tower and having a melting crucible to which the material t... | 12/28/2010 |
| 7744810 | Microwave iron-making furnace A reactor has a casing composed of a magnesia-based refractory, and a bottom plate composed of an MgO-graphite mixed refractory is disposed on a bottom part of this casing. A graphite crucible is provided at a bottom of the reactor, and the graphite crucible and the... | 06/29/2010 |
| 7364691 | Metallurgical vessel A metallurgical vessel having a cylindrical upper end section and a top section fitted to the upper end of another section to form a top closure of the vessel about a central opening through which to extend a gas injection lance for injecting gas into the vessel. To... | 04/29/2008 |
| 7273583 | Process and apparatus for uniform combustion within a molten material A submerged combustion burner having co-axial fuel and oxidant tubes forming an annular space therebetween, wherein the outer tube extends beyond the end of the inner tube. A burner nozzle having an outside diameter corresponding to the inside diameter of the outer ... | 09/25/2007 |
| 7264766 | Feed apparatus and portable dust collector A feed apparatus feed apparatus for delivering particulate material to a foundry furnace having disposed therein a furnace form defining an annulus with the furnace exterior wall for receipt of the particulate material. The novel feed apparatus broadly includes a co... | 09/04/2007 |
| 7235210 | Metal melting furnace There is provided a novel construction of a metal melting furnace that can preheat and melt the entire material more efficiently and that can facilitate operations for removing oxides deposited on the surface around the melting burner and the inside thereof and thus... | 06/26/2007 |
| 7160501 | Method for the salt-free, non-oxidizing remelting of aluminium Process and device for saltless, oxidation-free remelting of aluminum, its alloys and of aluminum scrap with miscellaneous impurities, such as combustible oily substances, adherent combustible or noncombustible materials and those with a higher specific weight in a ... | 01/09/2007 |
| 7060220 | Metal melting furnace In a metal melting furnace, a separation wall 60 is provided between an inclined hearth 30 and a molten metal reservoir 35 to define a molten metal processing portion 65. The separation wall is provided with a connecting passage 61... | 06/13/2006 |
| 6973955 | Heated trough for molten metal A trough is described for carrying molten metal, comprising an outer shell defined by a bottom wall and two side walls, an insulating layer filling the outer shell and a conductive U-shaped refractory trough body for carrying molten metal, the trough body being embe... | 12/13/2005 |
| 6918427 | Process and apparatus for preparing a metal alloy A method and apparatus for producing a metal component from a non-dendritic, semi-solid metal alloy slurry involves the use of a graphite agitator that is functionally equivalent to conventional metal rod agitators, and has the additional advantage of having a very ... | 07/19/2005 |
| 6910521 | Casting apparatus and molten metal feed apparatus A molten metal feed apparatus which can feed molten metal into a casting apparatus by opening a vessel and which is free from leakage of the molten metal from the opening/closing part of the vessel, provided with a holding vessel having an opening at its bottom and ... | 06/28/2005 |
| 6818176 | Oxy-fueled waste incinerator and method An oxygen fueled combustion system includes a furnace having at least one burner, an oxygen supply for supplying oxygen having a predetermined purity, and a carbon based fuel supply for supplying a carbon based fuel. The oxygen and the carbon based fuel are fed into... | 11/16/2004 |
| 6797228 | Oxy-fueled aluminum recovery method An oxygen fueled combustion system includes a furnace having at least one burner, an oxygen supply for supplying oxygen having a predetermined purity, and a carbon based fuel supply for supplying a carbon based fuel. The oxygen and the carbon based fuel are fed into... | 09/28/2004 |
| 6680023 | Crucible for molten aluminum A container for molten metal which uses heat of solidification for heating the molten metal.... | 01/20/2004 |
| 6645270 | Method of heating a crucible for molten aluminum A method of heating molten aluminum in a container utilizing gas stirring means.... | 11/11/2003 |
| 6613291 | Installation for vitrification of liquid radioactive wastes, cooled discharge unit and cooled induction melter for the installation The present invention relates to apparatuses for processing homogeneous/heterogeneous radioactive wastes comprising ion-exchange reisns. A cooled discharge unit comprises a discharge pipe, a cooling jacket having a U-shaped form in cross section, a collec... | 09/02/2003 |
| 6608856 | Crucible melting furnace A crucible melting furnace has a feature it has a high thermal efficiency and that differences in temperature does not substantially occur in a molten metal within a crucible and can provide products of uniform quality. Moreover, the crucible melting furn... | 08/19/2003 |
| 6585797 | Recirculating molten metal supply system and method The melter furnace includes a heating chamber (16), a pump chamber (18), a degassing chamber (20), and a filter chamber (22). The pump chamber (18) is located adjacent the heating chamber (16) and houses a molten metal pump (30). The degassing chamber (20... | 07/01/2003 |
| 6544469 | Apparatus and method for producing metal formed product An apparatus for producing a metal formed product comprises a molten metal-holding furnace; a semisolidified metal-producing mechanism; a cooling member-restoring mechanism arranged adjacent to the semisolidified metal-producing mechanism, for applying a ... | 04/08/2003 |
| 6516868 | Molten metal holder furnace and casting system incorporating the molten metal holder furnace A bottom heated holder furnace (12) for containing a supply of molten metal includes a storage vessel (30) having sidewalls (32) and a bottom wall (34) defining a molten metal receiving chamber (36). A furnace insulating layer (42) lines the molten metal ... | 02/11/2003 |
| 6517771 | Superadiabatic combustion generation of reducing atmosphere for metal heat treatment A system useful for superadiabatic combustion generation of a reducing atmosphere for metal heat treatment includes a superadiabatic reactor which supplies a reducing atmosphere to a metal heat treatment apparatus.... | 02/11/2003 |
| 6485675 | Bottom for a metallurgical vessel with a direct current electric arc device A base of a metallurgical vessel having a direct-current arc device whose cathode projects into the vessel and in whose fire-resistant lining on the base at least one anode is arranged, one end of which, passing through the vessel wall, touches metallic m... | 11/26/2002 |
| 6451248 | Pressurized molten metal holder furnace A bottom heated holder furnace (10) for containing a supply of molten metal includes a storage vessel (20) having sidewalls (22) and a bottom wall (24) defining a molten metal receiving chamber (26). A furnace insulating layer (32) lines the molten metal ... | 09/17/2002 |
| 6436337 | Oxy-fuel combustion system and uses therefor An oxygen fueled combustion system includes a furnace having at least one burner, an oxygen supply for supplying oxygen having a predetermined purity, and a carbon based fuel supply for supplying a carbon based fuel. The oxygen and the carbon based fuel a... | 08/20/2002 |
| 6426037 | Dosing chamber method and apparatus A dosing chamber is insertable within and removable from the metal holding chamber of a molten metal furnace and is not formed as an integral part of the refractory lining of the molten metal furnace. The dosing chamber includes a chamber shell having a g... | 07/30/2002 |
| 6399017 | Method and apparatus for containing and ejecting a thixotropic metal slurry A container system including a vessel for holding a thixotropic semi-solid aluminum alloy slurry during its processing as a billet and an ejection system for cleanly discharging the processed thixotropic semi-solid aluminum billet. The crucible is prefera... | 06/04/2002 |
| 6290899 | Converter installation having a divided sealing ring fitted between the converter and the flue gas chimney A converter plant with a sealing ring provided between the hood of a tiltable converter and the mouth of a smoke gas flue, drives are provided, for moving the sealing ring can be moved so far away from the converter hood that the converter can be tilted w... | 09/18/2001 |
| 6214286 | Hybrid induction skull melting A solid charge of metal or alloy is placing in a crucible melting chamber defined by a monolithic refractory tubular sleeve disposed on a water cooled metallic base, an energizing induction coil disposed about the sleeve to inductively heat the solid char... | 04/10/2001 |
| 6165411 | Apparatus for producing metal to be semimolten-molded An improved apparatus for producing a semisolid shaping metal that has fine primary crystals dispersed in the liquid phase and which also has a uniform temperature distribution comprises a melt pouring section comprising a melting furnace which melts and ... | 12/26/2000 |
| 6066289 | Method for heating molten metal using heated baffle A method of heating a body of molten metal passing through a treatment bay. The method comprises providing a body of molten metal in a treatment bay and providing a baffle heater in the treatment bay to contact the molten metal. The baffle heater is compr... | 05/23/2000 |
| 6060014 | Gas dispersion apparatus for molten aluminum refining The maximum useful rate of aluminum refining is substantially increased by the incorporation of baffle means across the refining chamber under the rotor of a spinning nozzle assembly positioned in the refining chamber during aluminum refining operations.... | 05/09/2000 |
| 6049067 | Heated crucible for molten aluminum An improved crucible for containing a body of molten aluminum and maintaining the molten aluminum at a predetermined temperature for transportation, the crucible comprised of a bottom and sides joined together to contain the molten aluminum and a liner co... | 04/11/2000 |
| 5997291 | Hot-melt material for heating plate A heating element assembly for use in a rapid prototype modeling machine is described. The heating element of the hot melt assembly and an associated product container deliver hot melt product to the jets of the rapid prototype modeling machine.... | 12/07/1999 |
| 5981900 | Method of annealing silicon carbide for activation of ion-implanted dopants A method and crucible for annealing SiC at high temperatures. The crucible is a vessel having a peripheral wall, at least two compartments separated by an inner wall within the peripheral wall and a lid which separates the compartments from the crucible s... | 11/09/1999 |
| 5981917 | Ladle preheat indication system A ladle preheating system and method in which heat input rate to the ladle is calculated and monitored throughout the preheating period, calculating the moving average slope representing change over time of the rate of change of heat input, correcting the... | 11/09/1999 |
| 5882582 | Liquid metal heating and casting ladle A ladle (1) comprising a main portion (5), an outlet (3) and an inductor assembly (2) fitted onto the main portion. The main portion comprises a cavity (13) defined by a refractory lining, provided with at least one opening (21) and shaped so that no pock... | 03/16/1999 |
| 5882581 | Apparatus for the processing of solid mixed waste containing radioactive and hazardous materials Apparatus for the continuous heating and melting of a solid mixed waste bearing radioactive and hazardous materials to form separate metallic, slag and gaseous phases for producing compact forms of the waste material to facilitate disposal includes a copp... | 03/16/1999 |
| 5876661 | Heater for tanks containing a bath of molten metal The invention relates to a method of heating tanks, such as galvanizing tanks, containing a bath of molten metal. Use is made of at least one element made of a refractory material which is thermally conducting and substantially gas-tight, particularly in ... | 03/02/1999 |
| 5810907 | Continuous melting apparatus for low-melting point metal, improved crucible for such apparatus, and melting method using such apparatus A continuous melting apparatus for a low melting point metal is disclosed. The apparatus includes a melting furnace main body (5) forming a combustion chamber (6) surrounded by a refractory lining, a crucible (1) formed with a tapping orifice (2) at an ap... | 09/22/1998 |
