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Class Information
Number: 148/213
Name: Metal treatment > Process of modifying or maintaining internal physical structure (i.e., microstructure) or chemical properties of metal, process of reactive coating of metal and process of chemical-heat removing (e.g., flame-cutting, etc.) or burning of metal > Carburizing or nitriding using externally supplied carbon or nitrogen source > Of selected surface area (e.g., zone, top only, etc.) > Utilizing attached protective shield, mask or coating
Description: Process wherein a portion of a workpiece is covered with a temporary protective shield, mask or coating that prohibits the carburizing or nitridizing action in an area to which it is attached and which is not intended to remain a part of the final product and acts in transitory manner to achieve the carburizing or nitridizing of a selective surface area.

Sub-classes under this class:

Class Number Class Name Patents
148/214 With noncarburizing or non-nitriding coating 10

Patents under this class:

Patent Number Title Of Patent Date Issued
7524382 Method for substrate stabilization of diffusion aluminide coated nickel-based superalloys Apr. 28, 2009
6964712 Hardening protection compositions for partial carburization of metallic components Nov. 15, 2005
6776854 Process and apparatus for the partial thermochemical vacuum treatment of metallic workpieces Aug. 17, 2004
6458220 Case hardened steel blades for sports equipment and method of manufacture Oct. 1, 2002
6238489 Methods and apparatus for masking a percussive drill member prior to a surface treatment thereof May. 29, 2001
6165597 Selective case hardening processes at low temperature Dec. 26, 2000
6110184 Introducer with vascular sealing mechanism Aug. 29, 2000
5785771 Method for manufacturing precision gears Jul. 28, 1998
4771689 Unitary spring armature for a dot matrix printer Sep. 20, 1988
4693760 Ion implanation of titanium workpieces without surface discoloration Sep. 15, 1987
4664722 Method for protecting from hardening a selected region of a steel structure May. 12, 1987
4469530 Method for reducing the hardening distortion during case hardening of large toothed rims formed of steel and support body members suitable for such purpose Sep. 4, 1984
4279528 Tulip member for a tripod joint and process for producing the same Jul. 21, 1981
4165243 Method of making selectively carburized forged powder metal parts Aug. 21, 1979
4154628 Quench hardening of gears May. 15, 1979
4062702 Process for partially insulating surfaces of metal work pieces Dec. 13, 1977
3994752 Annealing treatment for controlling warhead fragmentation size distribution Nov. 30, 1976
3969158 Process for treating 9% nickel steel Jul. 13, 1976

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