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| Number | Title | Issue Date |
| 6903316 | Method and apparatus for induction hardening An apparatus and method for induction hardening a workpiece can first include fastening a workpiece in a clamping assembly. The clamping assembly is provided with a plurality of hardness testing devices. Alternatively, one or more hardness testing devices are provid... | 06/07/2005 |
| 6821363 | Procedure for hardening at least one surface of a wall of a component and device for its execution A procedure for hardening at least one surface (S, L) of a wall (W) of a component (T), in which the surface to be hardened (S, L) is inductively heated with at least one inductor (2), in which liquid is filled into a gap (P) between the surface to be hardene... | 11/23/2004 |
| 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 |
| 5018706 | Apparatus for inhibiting stress corrosion cracking Method and apapratus for inhibiting stress corrosion cracking adjacent weldments in steel workpieces such as stainless steel pipe through generation of a controllable throughwall temperature differential by exposure of one workpiece surface to extermally ... | 05/28/1991 |
| 4468010 | Method and apparatus for quench hardening thin-walled, elongated workpieces A method and apparatus of quench hardening to a desired depth the inner surface of an axially extending bore in an elongated, thin-walled workpiece having an outer, axially extending surface wherein the bore has a selected, uniform cross-sectional shape, ... | 08/28/1984 |
| 4441698 | Furnace for the heat treatment of drills The furnace effects a partial heat-treatment of drills and similar tools having a clamping portion and a working portion and with respect to which it is important to subjecting only the working portion, to a heat treatment, particularly hardening. The phy... | 04/10/1984 |
