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| Number | Title | Issue Date |
| 7892364 | Surface modifying jig of engine valve and surface modifying method employing it A surface modifying jig of an engine valve comprising a substantially circular ring portion for holding the valve head of an engine valve, a head holding portion having a diameter decreasing gradually downward from the inner circumferential side of the ring portion,... | 02/22/2011 |
| 7754028 | Plasma-nitriding of maraging steel, shaver cap for an electric shaver, cutting device made out of such steel and an electric shaver The invention relates to a method for the plasma-nitriding of precipitation-hardenable stainless steels or stainless maraging steels. The invention also relates to a shaver cap for an electric shaver. The invention also relates to a cutting device. The invention fur... | 07/13/2010 |
| 7556699 | Method of plasma nitriding of metals via nitrogen charging A method of nitriding a metal includes transforming a surface region of a generally nitrogen-free metal into a nitrogen-containing solid solution surface region. A first heating process heats the surface region at a first temperature in the presence of a nitrogen ga... | 07/07/2009 |
| 7465362 | Plasma-assisted nitrogen surface-treatment Methods and systems (10) for plasma-assisted nitrogen surface-treatments are provided. The method can include subjecting a gas (24) to electromagnetic radiation (26) in the presence of a plasma catalyst (100, 120, 140) to initiate a plasm... | 12/16/2008 |
| 7347136 | Airless sprayer with hardened cylinder An airless sprayer for paint or the like consists of an electric drive unit connected to a piston. Driven by the electric drive unit, the piston reciprocates within the cylinder, thus spraying the paint or the like. Because of the close tolerance between the piston ... | 03/25/2008 |
| 7291229 | Method of surface treatment of titanium metal A method of carburizing treatment is proposed in which if carburizing is carried out at a low temperature, carbon will not turn amorphose and deposit on the surface of a titanium metal but reliably penetrate into between metallic atoms. It is a method of surface tre... | 11/06/2007 |
| 7261914 | Method and apparatus for forming a nitride layer on a biomedical device This invention is a method of forming a nitride layer on at least one metal or metal alloy biomedical device, comprising: providing a vacuum chamber with at least one biomedical device positioned thereon on a worktable within the vacuum chamber; reducing the pressur... | 08/28/2007 |
| 7247348 | Method for manufacturing a erosion preventative diamond-like coating for a turbine engine compressor blade Methods for making an erosion resistant gas turbine engine compressor airfoil substrates coated with a diamond-like coating (DLC), wherein the coating airfoil substrates are protected from ingested abrasive particulates, may include the step of performing a hydrogen... | 07/24/2007 |
| 7169239 | Solid expandable tubular members formed from very low carbon steel and method A very low carbon steel alloy is provided for use in manufacturing tubular members such as oil country tubular goods. The tubular members may be radially expanded from at least twenty percent to forty percent. Sections or joints of casing formed from the steel alloy... | 01/30/2007 |
| 7108756 | Method for heat-treating work pieces made of temperature-resistant steels A method of producing a workpiece of a heat-resistant steel, such as hot forming tool steel, where the workpiece may be hardened and depassivated after mechanical machining and electrochemical treatment. The hardening including a reduction step, so that no depassiva... | 09/19/2006 |
| 7074460 | Method for treating the surface of a part and resulting part A surface treatment method in which a surface of a part (7) is contacted with at least one activated species. The activated species is obtained by activating a gaseous medium containing at least two of the following elements: carbon, nitrogen, boron and oxyge... | 07/11/2006 |
| 7025167 | Shaft to transfer torque in a vehicle One preferred embodiment of the invention is a shaft to transfer torque in a vehicle including a first member having internal splines and a second member having external splines engagable with the internal splines to allow telescopic movement between the first membe... | 04/11/2006 |
| 6935618 | Valve component with multiple surface layers A sliding component, particularly a disk valve plate. The sliding component includes a multi-layer surface structure comprising a strengthening layer harder than the substrate material, and an amorphous diamond top layer. ... | 08/30/2005 |
| 6787731 | Method for oxyacetylene-cutting a piece of steel and device for carrying out this method The invention relates to apparatus for oxygen cutting pieces of steel. The cutter and trimmer members (5, 10) are positioned in such a manner that the cutting jet (6) is applied to the top face (1.1) of the piece (1) in a substantially ve... | 09/07/2004 |
| 6776854 | Process and apparatus for the partial thermochemical vacuum treatment of metallic workpieces In the partial thermochemical vacuum treatment of metallic workpieces (1), in particular in the carburization and case hardening of workpieces (1) of case-hardening steel in a carbon-containing atmosphere, surface regions (3, 4, 5, 6) to be trea... | 08/17/2004 |
| 6605160 | Repair of coatings and surfaces using reactive metals coating processes This invention pertains to the repair of parts comprising metals, and surfaces and coatings of these parts using reactive metals coating processes. Processes such as chemical vapor deposition (CVD), physical vapor deposition (PVD), plasma spray, and react... | 08/12/2003 |
| 6602353 | Method for nitriding-processing iron group series alloy substrate A processing method for nitriding an iron group series alloy substrate, or processing subject, containing an alloy element for forming nitride by plasma nitriding treatment including a passivated membrane removing treatment step. The passivated membrane r... | 08/05/2003 |
| 6589414 | Nitride layer forming methods Nitride layer formation includes a method wherein a material is electrodeposited on a substrate and converted, at least in part, to a layer comprising nitrogen and the electrodeposited material. The electrodepositing may occur substantially selective on a... | 07/08/2003 |
| 6454877 | Laser phase transformation and ion implantation in metals A method and apparatus are provided for treating the surface of a metal body through phase transformation, ion implantation, and/or diffusion and to form new phases of metallic materials. The method and apparatus have been shown to be particularly useful ... | 09/24/2002 |
| 6440230 | Nitride layer forming method Nitride layer formation includes a method where a material is electrodeposited on a substrate and converted, at least in part, to a layer comprising nitrogen and the electrodeposited material. The electrodepositing may occur substantially selective on a c... | 08/27/2002 |
| 6302971 | Process for making moveable pulley half A pulley useable with a driving belt in a continuously variable transmission, including a moveable pulley half having an integral cylinder portion integrally formed therewith by plastic working. The moveable pulley half includes an axially extending hollo... | 10/16/2001 |
| 6238490 | Process for the treatment of austenitic stainless steel articles Austenitic stainless steel articles are treated to produce a hardened surface layer thereon by plasma heat-treating the articles at a temperature in the range of 300 to 600° C. and at a pressure in the range of 100 to 1500 Pa in a carbon-containing treat... | 05/29/2001 |
| 6235128 | Carbon and alloy steels thermochemical treatments The present invention is a unique sequential process for treating carbon and alloy steels to improve resistance to tribological stresses while reducing conventional processing time required to obtain articles having a similar hardness. This process compri... | 05/22/2001 |
| 6179933 | Surface treatment of rolling element bearing steel Rolling-element bearing components made from high quality steel are subjected to ion nitriding in a plasma as a final step in the manufacturing process to produce a layer with a hardness around 800-1200 HV with a depth no more than 150 μm. By controlling... | 01/30/2001 |
| 6139296 | Method for treating metal surface, rotary shaft for refrigerant compressor treated by the method, vane for refrigerant compressor treated by the method, and refrigerant compressor using the same The present invention is to provide a refrigerant compressor comprising a compressing element driven by a rotary shaft, for compressing and discharging a sucked HFC type refrigerant or refrigerant mainly comprising the HFC type refrigerant by the compress... | 10/31/2000 |
| 6093303 | Low temperature case hardening processes A method for case hardening a chromium bearing nickel or ferrous based alloy, for example stainless steel, article, the method including the steps of activating the surface of the article; and carburizing the activated surface at a temperature below that ... | 07/25/2000 |
| 5989363 | Nitriding process and nitriding furnace therefor A nitriding process and nitriding furnace therefor wherein the parts to be treated are maintained at floating potentional in a vacuum furnace (9), current being provided to a metal screen (5) cathode surrounding the parts to be treated, the necessary heat... | 11/23/1999 |
| 5900126 | Method for manufacturing austenitic stainless steel substrate for magnetic-recording media An improved magnetic-recording disk and a process for manufacturing magnetic-recording disks are disclosed. A precision cold-rolled authentic stainless steel is the substrate for a magnetic-recording disk. The surface of the substrate may be hardened by p... | 05/04/1999 |
| 5882438 | Method for the formation of a frangible zone for the fracture separation of a machine part, in particular, a connecting rod for internal combustion engines For a method for the formation of a frangible zone for fracture separation of a part, namely a connecting rod for internal combustion engines, by which method, in a fracture plane for the intended triggered break-away, a frangible zone is formed along a s... | 03/16/1999 |
| 5868878 | Heat treatment by plasma electron heating and solid/gas jet cooling A workpiece is heated by first forming an ionized gas plasma around the workpiece. A positive potential is applied to the workpiece to accelerate electrons from the plasma into the workpiece. The workpiece is uniformly surface heated by the energy directe... | 02/09/1999 |
| 5851314 | Method for plasma carburization of metal workpieces A method for plasma carburization of metal workpieces in a furnace includes the step of introducing a mixture of propane and methane into the furnace atmosphere. The propane and methane mixture is cleaved under process conditions of plasma carburization t... | 12/22/1998 |
| 5851313 | Case-hardened stainless steel bearing component and process and manufacturing the same A stainless steel bearing component containing in excess of 11% chromium and between 0.05% and 0.50% carbon is case-hardened by introducing carbon or nitrogen into the surface of the race using a plasma process. The component is heated in a chamber from w... | 12/22/1998 |
| 5846341 | Method of carrying out diagnostics on a process for the thermo-chemical treatment of steels and alloys in a glow discharge and a device for carrying out the said method The proposed method of carrying out diagnostics on a process for the thermo-chemical treatment of steels and alloys in a glow discharge involves monitoring the ionization characteristics of the atmosphere as revealed by the intensity of the electromagneti... | 12/08/1998 |
| 5810947 | Method of surface modification for tool steels The adhesive strength and hardness of chromium nitride(CrN) film deposited on SKD 61 tool steel was significantly enhanced by a nitriding process on the surface the tool steel before coating with a CrN film. These nitriding processes included nitrocarburi... | 09/22/1998 |
| 5769965 | Method for treating at least one part of soft magnetic material to form a hard wear area A method for treating soft magnetic parts by annealing and producing a wear guard layer, in which the soft magnetic parts are either successively annealed and provided with a wear guard layer in a reaction chamber of a treatment apparatus, or the annealin... | 06/23/1998 |
| 5674416 | Arc treatment of metal surfaces A method and apparatus for graining a surface having a substantial area traveling at a substantial rate of speed. The method includes directing the surface past an array of electrical arcs traveling about a plurality of loop electrodes arranged to provide... | 10/07/1997 |
| 5658394 | Method for increasing the surface hardness of loom components exposed to friction Loom components such as reed dents or weft brake lamellae that, during operation, are exposed to frictional abrasion by a moving weft thread, are made of cold rolled strip steel or of refined nitrided steels. The components are then exposed to a heat trea... | 08/19/1997 |
| 5605580 | Carburization process In plasma carburization of the workpiece such as gears, etc., the present invention intends to make the carbon concentration of the carburized layer to be uniform at the edge portion and at the flat portion and also suppress generation of mesh-form carbid... | 02/25/1997 |
| 5558725 | Process for carburizing workpieces by means of a pulsed plasma discharge Workpieces of carburizable materials, especially steels, are carburized by means of a pulsed plasma discharge in a carbon-containing atmosphere at pressures of 0.1-30 mbars and at pulsed voltages of 200-2,000 V, preferably of 300-1,000 V. A continuously a... | 09/24/1996 |
| 5549764 | Wear resistant coated steel article A coated wear resistant steel article has a basic carburized low silicon steel article of preselected properties including carbides isotropically exposed and having an elevation greater than material adjacent said carbides of said carburized surface and a... | 08/27/1996 |
