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| Number | Title | Issue Date |
| 7514035 | Versatile high velocity integral vacuum furnace Versatile vacuum furnace (also having high internal pressure capability) designed for facilitating directed gas flow has a treating chamber including a long, low profile work zone configuration, and powerful gas recirculation equipment with unique structure supporti... | 04/07/2009 |
| 7435375 | Annealing furnace purging and oxidation system and method In an improved annealing furnace for laminations having a purge vestibule and an oxidation section, atmosphere injection tubes with atmosphere injection jets are provided in the oxidation section at a conveyor directly beneath trays conveying the laminations. Atmosp... | 10/14/2008 |
| 7410547 | Method and device for inhibiting contamination of a workpiece A method and device for inhibiting contamination of a workpiece during the heating of a workpiece by a contaminant. The method includes placing the workpiece in a first container, and, in a first step, filling the first container with a protective gas. The first con... | 08/12/2008 |
| 7361299 | Hydrogen closed-cycle hardening unit A hydrogen closed-cycle hardening unit is disclosed that consisting of a vacuum oven with an internal quenching and circulation system, adjusted to operate under a pressure of 2 MPa, fitted with conduits and valves for feeding and discharging of quenching atmosphere... | 04/22/2008 |
| 7357843 | Vacuum heat treating method and apparatus therefor The present invention provides a vacuum heat treating method, such as carburization, carbonitridation, high temperature carburization, high concentration carburization and the like, performed while supplying a mixed gas of ethylene gas and hydrogen gas under reduced... | 04/15/2008 |
| 7276204 | Carburization treatment method and carburization treatment apparatus The invention provides a carburization treatment method in which a carburization treatment is conducted simultaneously with an operation of supplying a hydrocarbon gas and an oxidative gas into a furnace kept under a reduced pressure. Preferably, the internal pressu... | 10/02/2007 |
| 7267793 | Furnace for vacuum carburizing with unsaturated aromatic hydrocarbons Vacuum carburizing of ferrous workpieces is performed at low pressure in a vacuum furnace using an unsaturated aromatic such as benzene as the carburizing medium. The unsaturated aromatic is gas phase hydrogenated into naphthenes, such as cyclohexane, which is meter... | 09/11/2007 |
| 7255829 | Method and apparatus for treatment of metallic workpieces A method and an apparatus for the thermal treatment of metallic workpieces with which gas quenching can be obtained that is low in distortion, even for workpieces with an undulating shape or workpieces that are projectingly stackable are provided. In accordance with... | 08/14/2007 |
| 7105126 | Flapper gas nozzle assembly A check valve assembly for the forced gas cooling system of a vacuum heat treating furnace is disclosed. The check valve assembly includes a check valve for installation on the exterior of a hot zone wall in a vacuum heat treating furnace. The check valve includes a... | 09/12/2006 |
| 7029625 | Continuous vacuum carburizing furnace A continuous vacuum carburizing furnace of the invention includes: a heating chamber for heating a workpiece under a atmospheric pressure; a first conditioning chamber in which the pressure is reduced from the atmospheric pressure after the receipt of the workpiece ... | 04/18/2006 |
| 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 |
| 6913449 | Apparatus for the treatment of metallic workpieces with cooling gas In an apparatus for the treatment of metallic workpieces (4) with cooling gas, having a cylindrical housing (3) with an opening at the end face for introducing and removing the workpieces (4), two support plates (6, 7) extending in parall... | 07/05/2005 |
| 6910614 | Vacuum compression brazing furnace and method of using same A vacuum heat treating furnace for brazing a large metallic part is disclosed. The vacuum furnace includes a pressure vessel having a cylindrical wall and a door dimensioned and positioned for closing an end of the cylindrical wall. A workpiece handling system is mo... | 06/28/2005 |
| 6903306 | Directional cooling system for vacuum heat treating furnace A furnace for heat treating of metal parts includes a hot zone enclosure defining a hot zone therein. The hot zone enclosure has a side wall, a first end wall, and a second end wall. The side wall has slots formed therethrough and along the length thereof. The heat ... | 06/07/2005 |
| 6767504 | Heat treatment furnace In a heat treating method and furnace used in this method which can prevent disturbance of an atmosphere gas inside a heat chamber, and can prevent deterioration of the processing quality and efficiency of work, a control section 4 first operates a vacuum pum... | 07/27/2004 |
| 6756566 | Convection heating system for vacuum furnaces A convection heating system includes a hot zone enclosure defining a hot zone and a plurality of gas injection nozzles for injecting a cooling gas into the heat treatment zone of furnace. Each gas injection nozzle may include a flap disposed and pivotally supported ... | 06/29/2004 |
| 6749800 | Arrangement and method for transporting metallic work pieces, and system for heat treatment of said work pieces An arrangement for transporting metallic work pieces includes a heat-insulated transport chamber, means for loading and unloading the work pieces, and transporting gear. To enable the flexible and efficient transport of the work pieces among a number of treatment ch... | 06/15/2004 |
| 6533991 | Cooling gas injection nozzle for a vacuum heat treating furnace A nozzle for injecting a cooling gas in a vacuum heat treating furnace is described. The cooling gas injection nozzle according to the present invention has a forward portion with a first central opening formed therethrough. The cooling gas injection nozz... | 03/18/2003 |
| 6527884 | Hydrogen annealing process and apparatus therefor An apparatus for selectively implementing a depressurized or an atmospheric hydrogen annealing process comprises a reaction chamber, a hydrogen gas introduction line for feeding hydrogen gas into the reaction chamber and an atmospheric exhaust line and a ... | 03/04/2003 |
| 6350406 | METHOD OF MANUFACTURING ANODE UNIT FOR SOLID ELECTROLYTIC CAPACITOR, ANODE UNIT FOR SOLID ELECTROLYTIC CAPACITOR, CONTINUOUS SINTERING APPARATUS, AND METHOD OF MANUFACTURING SECONDARY PARTICLES OF VALVE-ACTION METAL POWDER A method of manufacturing a sintered anode unit for a solid electrolytic capacitor is provided. According to this method, a press-molded or compacted pellet of a valve-action metal powder is sintered at a predetermined high temperature and in a predetermi... | 02/26/2002 |
| 6216358 | Gas-quenching cell A cell for gas-quenching a load is provided, including guiding plates and a stirring element driven by an engine to cause a gas flow between the load and an exchanger. The stirring element is an adjustable pitch blade propeller.... | 04/17/2001 |
| 5916388 | Method and apparatus for the treatment of stainless steel surfaces The invention includes an apparatus and associated method of increasing the pump-out efficiency of H2 O by, for example, reducing the staying time or the probability of sticking of H2 O or analogous molecules on a stainless steel sur... | 06/29/1999 |
| 5849244 | Method for vacuum loading A method and apparatus for loading tool steel and high speed steel powder to a deformable mold for compacting is disclosed. The particles are exposed to a uniform vacuum during transfer from a sealed container through a sealed conduit and into a sealed de... | 12/15/1998 |
| 5567381 | Hybrid heat treating furnace A hybrid furnace includes a vacuum furnace for heat treating a workpiece and a transportable oven removably attached to the vacuum furnace for holding the workpiece and maintaining it at an elevated temperature. The workpiece is transferred from the vacuu... | 10/22/1996 |
| 5556593 | Method and apparatus for heat treating metal parts A heat insulated enclosure with an inlet introducing metal parts such as coil springs to be heat treated, such as by annealing. The apparatus also includes a support on which the metal parts are received, where they are continuously moved towards an outle... | 09/17/1996 |
| 5524020 | Vacuum furnace with movable hot zone A high temperature vacuum heat treating furnace has a hot zone, including heating elements and thermal insulation, which is movable between a heating location at least partly surrounding a load space and a cooling location remote from the load space. A co... | 06/04/1996 |
| 5496017 | Kiln for firing and/or casting prosthodontic products The firing and/or casting kiln has a containment casing which internally forms a treatment chamber, a part holder which is movably mounted inside the treatment chamber, an opening for access to the treatment chamber, and a conditioning system for producin... | 03/05/1996 |
| 5419792 | Method and apparatus for cooling a workpiece Cooling of a workpiece is conducted at selected workpiece locations in accordance with predetermined heat flux, at the locations, required to result in a desired workpiece cooling rate for workpiece integrity, microstructure and mechanical properties. A c... | 05/30/1995 |
| 5225142 | Method and apparatus for the automatic monitoring of operating safety and for controlling the progress of the process in a vacuum heat-treatment oven In a vacuum heat treating oven operating with hydrogen under pressure as the cooling medium, especially for the quenching of greatly heated metal workpieces (5), a method is provided for the automatic control of the progress of the process and for monitor... | 07/06/1993 |
| 5121903 | Quenching arrangement for a furnace The present arrangement provides for having the plenum divided into at least two sections. One section dumps quench gas from a first direction into the hot zone chamber during a first period and the other section dumps quench gas into the hot zone from an... | 06/16/1992 |
| 5088697 | Heat treating apparatus A susceptor is located in a treating space of a CVD apparatus with a wafer placed in contact with a first surface of a susceptor. The susceptor is heated by a heating source to impart the heat to the wafer. A treating gas is supplied into a treating space... | 02/18/1992 |
| 5052923 | Oven for partial heat treatment of tools An oven for the partial heat treatment of tools, for example, twist drills, omprises a first section, which contains the heating chamber that is constantly at the desired operating temperature. A second section for the loading and unloading and the quenchi... | 10/01/1991 |
| 5035405 | Apparatus for annealing and quenching Annealing and quenching method and apparatus for the implementation of the method. An annealing and quenching method for materials or parts referred to as a charge that is finish-annealed in a vacuum annealing plant and that then proceeds into a sluice ch... | 07/30/1991 |
| 4938458 | Continuous ion-carburizing and quenching system A heating process, a carburizing process and a diffusion process are successively carried out in a continuous ion-carburizing and quenching system, which is provided with a rotary hearth type continuous ion-carburizing furnace and a continuous diffusion f... | 07/03/1990 |
| 4869470 | Vacuum furnace for heat treatment of metallic workpieces A vacuum furnace for heat treatment of metallic workpieces wherein the heat conductors are formed as conduits fitted with bore holes and connected by electrical insulators to coolant gas distributor.... | 09/26/1989 |
| 4807853 | Continuous furnace for gas carburizing and hardening A method of gas carburizing and hardening a steel article and a continuous furnace therefor. The method includes the steps of carburizing the article in a carburizing atmosphere at atmospheric pressure, heating the article in a vacuum for a predetermined ... | 02/28/1989 |
| 4709904 | Vacuum furnace for heat-treating a charge A method and vacuum furnace for heat-treating a charge. Pursuant to the method, after the charge is placed in the receiving vessel, the latter is evacuated and flooded with inert gas. Subsequently, the charge is heated to the maximum permissible operating... | 12/01/1987 |
| 4653732 | Multi-chamber vacuum furnace for heat-treating metal articles An industrial furnace for heat-treating metallic workpieces has separate heating and cooling chambers. The latter uses a circulating cooling gas, the flow of which against or past the workpieces produces cooling or gas-quenching. The furnace may have anot... | 03/31/1987 |
| 4647017 | Vacuum heat treating furnace and quench system with drop transfer A vacuum heat treating furnace and quench system in which a load hanger rod with attached load is suspended vertically from the vacuum chamber top cover assembly, and at the end of the heating cycle segment is unlatched and permitted to free-fall through ... | 03/03/1987 |
| 4634103 | Oven equipment for cooling a charge after thermal treatment A method and oven equipment for cooling a charge after thermal treatment. The charge, which is located within a closed chamber, is cooled by blowing in cooling gas. The cooling occurs as a function of the actual conditions of the charge at a predetermined... | 01/06/1987 |
