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| Number | Title | Issue Date |
| 6982120 | Hardened steel components and process of treating the same The invention relates to components made of steel, more particularly outer joint parts and inner joint parts of constant velocity joints, and to a process of heat treating such components made of steel. The heat treatment operation includes the process stages of nit... | 01/03/2006 |
| 6964712 | Hardening protection compositions for partial carburization of metallic components Hardening protection compositions based on substances which form boron glass for partial carburization of metallic components, which contain magnesium-silicon compounds as an additive. These hardening protection compositions can be used very advantageously in proces... | 11/15/2005 |
| 6808680 | Method of preventing or stopping sulfuric corrosion of metals A method is disclosed for prevention or stoppage of sulfidation or sulfuric corrosion of metal surfaces in contact with fluids including sulfiding compounds, where the method involves the addition of a compound to the fluid, where the additive has a higher affinity ... | 10/26/2004 |
| 6482272 | Method of preventing nitridation or carburization of metals A method is disclosed for prevention nitridation or carburization of metal surfaces in contact with a fluid including nitriding agents or carburizing agents where the method involves adding to the fluid an effective amount a sulfur-containing compound and... | 11/19/2002 |
| 6165597 | Selective case hardening processes at low temperature A selectively case hardened steel article by low temperature carburization includes a body made of a chromium bearing nickel or ferrous based alloy (for example, stainless steel), a first portion of the body having a first hardness characteristic, and a s... | 12/26/2000 |
| 6090223 | Chromium nitride film and method for forming the same By forming a Cr playing layer on the surface of a metal and forming a CrN film by nitriding the surface thereof, it is possible to improve the surface hardness, wear resistance, corrosion resistance, etc., of the metal; wherein the nitriding treatment of ... | 07/18/2000 |
| 5785771 | Method for manufacturing precision gears A method for manufacturing precision gears (10) including an initial step of providing a shaped workpiece (30S) defining a plurality of gear teeth (12) and, furthermore, defining a tooth space surface (68) defined by and between adjacent gear t... | 07/28/1998 |
| 4746376 | Method of preventing diffusion of N2, O2 or C in selected metal surfaces A method and composition for stopping-off nitrogen and/or carbon diffusion into metal surfaces. The composition, which is a mixture of a refractory material selected from the group of zirconium and aluminosilicate, sodium silicofluoride and sodium silicat... | 05/24/1988 |
| 4655851 | Simultaneous carburizing and boronizing of earth boring drill bits Disclosed herein are treatments for the manufacture of earth boring drill bits having abrasive wear resistant seal surfaces. The external surface of the bearing pin is surface treated, as by carburizing, in one region and simultaneously boronized over the... | 04/07/1987 |
| 4062701 | Method of forming end flanges The method is performed on a cylinder having at least one end opening for receiving a flange forming tool. An annular shoulder is formed extending from the outside of the cylinder substantially perpendicular to the axis of the cylinder. Also, an annular e... | 12/13/1977 |
