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| Number | Title | Issue Date |
| 7231798 | System and method for tube bending A method for bending a tube in a pre-selected geometry includes deriving at least one processing parameter from the geometry, applying a thermal source circumferentially to the tube to heat the tube along at least one circumferentially directed path in accordance wi... | 06/19/2007 |
| 6719855 | Fe—cr—al based alloy foil and method for producing the same The present invention provides an Fe—Cr—Al-based alloy for catalyst carriers and a foil thereof having a thickness of 40 μm or less, the alloy and the foil improved in the oxidation resistance at high temperatures and having excellent deformation resistance. Sp... | 04/13/2004 |
| 6364972 | Method for selectively hardening a carbon steel screw A carbon steel screw has one or more portions which have been selectively hardened by selective heat treatment and quenching. In one embodiment, an upper portion of the screw head is selectively hardened to prevent or reduce damage when torque is applied ... | 04/02/2002 |
| 6273974 | Selected heat treatment and hardening method for nails A selectively hardened nail includes a nail head, an elongated shank, and a tip. A portion of the nail shank is made harder than the remainder by selectively heat treating that portion, and cooling it. The nail has controlled bending properties. The selec... | 08/14/2001 |
| 5256217 | Multi-surface flame hardening machine and process An apparatus (10) for heat treat hardening multiple wear surfaces (24,26,28) of a metal workpart (14). Flame burners (38) and associated trailing quenches (36) travel along a linear and vertical path (13) across the workpart (14) to flame harden the wear ... | 10/26/1993 |
| 5252152 | Method of controlling warpage in workpiece by selective flame-hardening and vibrations A method for stress-relieving a flame-hardened component by vibrating the workpiece as it is being flame-hardened, and then vibrating the workpiece after it has been flame-hardened, measuring the workpiece to detect warpage, straightening the workpiece to... | 10/12/1993 |
| 5238509 | Method for carrying out a remelting/hardening treatment Remelting/hardening treatment is carried out for a work by a remelting/hardening treatment apparatus including a torch for heating the work. First, the work is firmly placed in position in the remelting/hardening treatment apparatus and a temperature of t... | 08/24/1993 |
| 4431466 | Method for making armor plate A method for making armor plate which comprises commencing with a homogeneous metal plate that has been hardened. Then moving the plate into a liquid bath while applying heat to one surface of the plate. The plate is progressively moved into the bath at a... | 02/14/1984 |
| 4312685 | Surface hardening of cams of motor-vehicle camshafts A cam of a camshaft has its surface hardened by rotating the camshaft about its axis while maintaining a TIG torch at a fixed spacing from the surface, and while relatively axially reciprocating the torch and the camshaft so the torch heats the surface al... | 01/26/1982 |
| 4257831 | Process for the continuous hardening of pump casings The invention relates to an economic process and apparatus for the continuous hardening of pump casings by means of flame hardening, with or without modifications to the core characteristics. As a result the life of the thus treated pump casing is conside... | 03/24/1981 |
| 4030951 | Method of hardening saw teeth This invention provides a method for hardening sawteeth which comprises contacting running water with the top ends of sawteeth in air, blowing flames to the top ends of the sawteeth in this state to thereby blow off the running water at parts enveloping t... | 06/21/1977 |
| 4029526 | Method of flame hardening gears Flame hardening method and apparatus for tempering gear teeth and the like which comprises quench means for rapidly cooling selected ones of the gear teeth to a temperature which avoids the formation of decomposition products, and a heat source spaced fro... | 06/14/1977 |
