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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7012947 | Arrangement for fastening heating elements to a furnace The invention relates to an arrangement for mounting electric heating elements in a furnace in which objects are intended to be heated, wherein the furnace wall includes a furnace insulation (4) comprised of high grade brick, and wherein the heating zones ( | 03/14/2006 |
| 6993060 | Resistor made from carbonaceous material A crenellated resistor made from a carbonaceous material and having the shape of a hollow cylinder for use in furnaces working at high temperature. The resistor is characterized by the thickness of the cylinder walls which follows a profile determined so as to produ... | 01/31/2006 |
| 6947467 | Cooling system for heat treating furnace An electric resistance high temperature vacuum furnace having radiant heating units evenly spaced around the sides and ends of the furnace hot zone. Pairs of units are automatically regulated both radially and longitudinally according to the temperature required by ... | 09/20/2005 |
| 6700918 | Electric furnace for the production of metal oxides The furnace comprises a tubular inner chamber for the treatment of the raw material, mounted inside the enveloping body of the furnace which is insulated from the exterior and is provided with internal resistor systems for heating the chamber of the furna... | 03/02/2004 |
| 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 |
| 6529544 | Vacuum heat treating furnace An electric resistance high temperature vacuum furnace having radiant heating units evenly spaced around the sides and ends of the furnace hot zone. Pairs of units are automatically regulated both radially and longitudinally according to the temperature r... | 03/04/2003 |
| 6307874 | Expansion loops for heating elements in vacuum furnaces A heating element for a vacuum heat treating furnace, a hot zone for a vacuum heat treating furnace, and a vacuum furnace are disclosed. The heating element includes a first heating element portion formed of a thin form of conductive, refractory metal or ... | 10/23/2001 |
| 6157004 | Electric heating or preheating furnace particularly for lining cylinders and/or for firing metal-ceramic A heating or preheating furnace for lining cylinders made of refractory material, where those cylinders are particularly designed to act as molds for the lost wax casting of precious metals, semiprecious metals, base metals or titanium or alloys thereof i... | 12/05/2000 |
| 6125658 | Glass furnace and installation comprising same The invention relates to the electric melting technique, in which the melting energy is dissipated in the bath of melted glass as a result of the Joule effect by means of electrodes which dip through the surface of the bath. According to the invention, th... | 10/03/2000 |
| 6061384 | Process and apparatus for the production of activated carbon An improved process and apparatus for the production and reactivation of activated carbon comprising the passing of a substrate through one or more zones defined by electrodes. Electrical energy passing through the bed of substrate creates heat that suppo... | 05/09/2000 |
| 6031207 | Sintering kiln A kiln, useful for sintering basemetal capacitors comprises an inner zone having vertically oriented gas dispersion conduits for the inlet and radial dispersion of gas and vertically oriented electrical heating elements. Each gas dispersion conduit compri... | 02/29/2000 |
| 5946341 | Method pertaining to the operation of electric furnaces, and a furnace An electrically heated furnace includes an inner furnace chamber provided with heating elements of stabilized zirconium dioxide, and an outer furnace chamber in which further heating elements that can work at temperatures above 1800° C. in an oxygen-cont... | 08/31/1999 |
| 5946342 | Process and apparatus for the production of activated carbon An improved process and apparatus for the production and reactivation of activated carbon comprising the passing of a substrate through one or more zones defined by electrodes. Electrical energy passing through the bed of substrate creates heat that suppo... | 08/31/1999 |
| 5881090 | Quartz used in semiconductor manufacturing device, apparatus for manufacturing the quartz, and method for manufacturing the same An inner chamber is arranged inside an outer chamber and stores quartz crystal powder. A space is defined between the inner chamber and the outer chamber, and an oxygen gas is introduced into that space. The quartz crystal powder is supplied from the inne... | 03/09/1999 |
| 5835525 | Furnaces and linings having segments with surfaces configured to absorb and reradiate heat Dual electric/gas heating in a crucible melting furnace with segmental lining, and lining and segments of linings for same, are disclosed.... | 11/10/1998 |
| 5703901 | Calcination furnace A calcination furnace capable of variably setting calcination conditions such as a size of a calcination chamber, a temperature, a temperature distribution and flowing of gas in the calcination chamber; and the like depending on calcined intermediate prod... | 12/30/1997 |
| 5665302 | Method and equipment for bringing metal alloy ingots, billets and the like to the semisolid or semiliquid state in readiness for thixotropic forming Equipment for bringing ingots of thixotropic metal alloy to the semisolid or semiliquid state including a heat chamber for holding the solid ingots introduced at ambient temperature, and a source generating air currents within the chamber to heat the ingo... | 09/09/1997 |
| 5579334 | Method and apparatus for reacting solid particulate reagents in an electric furnace A furnace comprises a furnace shell rotatable about a rotational axis. The furnace shell provides a furnace chamber for holding a solid particulate reagent as the furnace shell rotates. At least two electrodes are exposed to the chamber and are mounted in... | 11/26/1996 |
| 5559826 | Calcination furnace A calcination furnace capable of variably setting calcination conditions such as a size of a calcination chamber, a temperature, a temperature distribution and flowing of gas in the calcination chamber; and the like depending on calcined intermediate prod... | 09/24/1996 |
| 5517001 | High performance horizontal diffusion furnace system Performance of a high temperature diffusion furnace is enhanced by an improved multi-furnace module design. The furnace is constructed of materials suitable for clean room environments with an adjustable leveling frame assembly. A slide out assembly and h... | 05/14/1996 |
| 5501159 | Method of controlling hydrocarbon release rate by maintaining target oxygen concentration in discharge gases In a hydrocarbon release rate controlling method, a first chamber is provided capable of receiving successive batches of feed materials for thermal processing having widely varying energy content, heating is produced in the first chamber to cause pyrolyzi... | 03/26/1996 |
| 5502742 | Heat treating furnace with removable floor, adjustable heating element support, and threaded ceramic gas injection nozzle A heat treating furnace has a hot zone enclosure with a substantially rectangular cross section. The floor of the hot zone enclosure is formed such that it is removable independently of the remainder of the hot zone enclosure. The heat treating furnace ha... | 03/26/1996 |
| 5498852 | Oval top loading kiln having removable shelves A kiln method and apparatus wherein a kiln chamber is formed of appropriate material, preferably having an oval cross-section with grooves in the narrower sides of the oval and oval shaped shelves which can be inserted into the oval chamber and turned so ... | 03/12/1996 |
| 5467365 | Process for the recovery of lead arising especially from the active material of spent batteries, and electric furnace intended especially for the use of the process An electric furnace (containing an immersed electrode) and a process for the recovery of lead, arising especially from solid residues. Fines, which are a product of physically crushing spent batteries, are melted under not very reducing conditions in the ... | 11/14/1995 |
| 5432319 | Furnace for heat treatment of dental products in an inert atmosphere A high temperature furnace for heat treatment of various products, and for sintering. One of the uses is for preparing dental products such as dental crowns, bridges, implants and the like. The main component of the furnace is a cup-shaped quartz vessel, ... | 07/11/1995 |
| 5420394 | Casing and heater configuration in a material processing apparatus A material processing apparatus includes a casing including an outer wall having a substantially figure eight configuration, a plurality of upper inner walls disposed inside of the outer wall and being spaced apart and having substantially concentric cyli... | 05/30/1995 |
| 5405264 | Device for carrying a charge in a furnace A device for carrying a charge in a reheating furnaces comprising at least one skid pipe through which a cooling fluid flows, the skid pipe having at least one rider provided with at least one surface to support said charge running off center in the longi... | 04/11/1995 |
| 5406582 | Apparatus and process for activation and reactivation of carbon by electrical resistance heating in the presence of steam An apparatus and process for the activation or reactivation of carbon in a tubular reactor that consists of two or more sequential sections, each section containing a descending column of carbon, with inlets to introduce steam into any one or more of the ... | 04/11/1995 |
| 5353719 | Apparatus and method for controlled processing of materials An apparatus for controlled processing of materials includes a coolant jacketed vessel defining a first pyrolysis chamber and a second oxidation chamber, first heating elements mounted in the vessel to pyrolyze materials in the first chamber, second heati... | 10/11/1994 |
| 5327454 | Bridge for connecting cores in a manufacturing equipment of polycrystal silicon In a equipment for manufacturing polycrystal silicon by depositing it on filament cores electrically heated, by means of thermal decomposition of monosilane gas, a bridge for connecting said filament cores is constituted by tantalum, molybdenum, tungsten ... | 07/05/1994 |
| 5317592 | Direct resistance heating electrical furnace assembly and method of operating same A direct resistance heating electrical furnace of the type in which a bed of electrically conductive elements are located between two spaced electrodes in the furnace, and a method of controlling the operation of same, are provided. The furnace is of the ... | 05/31/1994 |
| 5289787 | Multiple unit material processing apparatus A material processing apparatus includes a casing having outer and inner spaced walls forming an airtight vessel inside of the inner walls and a channel between the outer and inner walls surrounding the vessel for containing a flow of coolant fluid. The v... | 03/01/1994 |
| 5287383 | Method and apparatus for producing active carbon using carbon-containing material An apparatus for producing an active carbon using a carbon-containing material inclusive of an used active carbon as a raw material wherein the carbon-containing raw material is carbonized in a carbonizing unit to produce a carbonized material having elec... | 02/15/1994 |
| 5283804 | Process and apparatus for graphitizing carbon bodies Carbon bodies to be graphitized are clamped together in a horizontal train, n which adjacent end faces of said bodies adjoin each other, and are heated by a flow of electric current in a graphitizing zone and subsequently cooled in a cooling zone. Individu... | 02/01/1994 |
| 5251231 | Vacuum furnace An electrically heated vacuum furnace has a plurality of heating elements (13) distributed in an array extending within the furnace. This allows accurate control of the application of radiant heat energy from the elements (13) of the array to articles (10... | 10/05/1993 |
| 5222074 | Thermal decomposition cell A thermal decomposition cell for producing a molecular beam from a material gas, includes: a crucible maintained at a given temperature necessary for thermal decomposition of the material gas which is effused in the crucible in a given direction; and a th... | 06/22/1993 |
| 5206880 | Furnace having tubes for cracking hydrocarbons A furnace for cracking of hydrocarbons, comprising one or several tubes through which the hydrocarbons flow during intensive heating and subsequent cracking. The starting material for the process can be e.g. naphtha or propane, mixed with a small amount o... | 04/27/1993 |
| 5200975 | Furnace for viscoelasticity measuring device with concentric gas cooling shield A double cylinder comprises an inside cylinder around which a heater wire is wound and a cylinder disposed outside thereof, and a furnace body filled an adiabatic material. Since cool air from a liquid vaporization type cooling device is passed through a ... | 04/06/1993 |
| 5193100 | Apparatus for detecting gaseous discharge in vacuum furnaces An electrically heated vacuum furnace is provided with special lead-through devices for transmitting current to the heating elements. In order to recognize gas discharges which can occur between a lead-through and a tank wall, the insulation of the lead-t... | 03/09/1993 |
| 5190901 | Method for producing active carbon using carbon-containing material A method and an apparatus for producing an active carbon using a carbon-containing material inclusive of an used active carbon as a raw material wherein the carbon-containing raw material is carbonized in a carbonizing unit to produce a carbonized materia... | 03/02/1993 |
