| Patents for C21D 1 - General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering (27,435) |
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| 05/31/1977 | US4026732 Method for induction hardening gear teeth |
| 05/31/1977 | US4026729 Method of making a soft steel sheet by continuous annealing |
| 05/24/1977 | US4025298 Walking beam furnace for round bar and the like |
| 05/24/1977 | US4025297 Rotary retort furnace |
| 05/24/1977 | US4025061 Apparatus for heat treatment of discrete metallic commodities |
| 05/17/1977 | US4023988 Heat treatment for ball bearing steel to improve resistance to rolling contact fatigue |
| 05/17/1977 | US4023667 Apparatus for unstacking flat steel material which is transported stacked on a rake cooling bed |
| 05/10/1977 | US4022446 Quenching in hot gas isostatic pressure furnace |
| 05/03/1977 | US4021274 Steel workpieces |
| 05/03/1977 | US4021272 Method of isothermal annealing of band steels for tools and razor blades |
| 04/26/1977 | US4019926 Forming a boron-containing oxide film on a iron-chromium alloy |
| 04/26/1977 | US4019560 Spray cooling of continuously cast ingots |
| 04/12/1977 | US4017708 Method and apparatus for heat treating an internal bore in a workpiece |
| 04/12/1977 | US4017703 Multiple station induction heating machine |
| 04/12/1977 | US4017338 Steel member for reinforcing rubber composites and method of making same |
| 04/05/1977 | US4016015 Rolled steel rod or bar |
| 04/05/1977 | US4016011 Cracking to produce environment of carbon monoxide, hydrogen and active carbon |
| 04/05/1977 | US4016009 Producing rolled steel products |
| 03/29/1977 | US4015100 Surface modification |
| 03/22/1977 | US4013279 Treatment furnace |
| 03/08/1977 | US4011430 Multizone electrical furnace methods and apparatus |
| 03/08/1977 | US4011112 Multi-sectioned cooling method for heated steel material |
| 03/08/1977 | US4011110 Method and apparatus for forming and treating bundles of steel rods |
| 03/01/1977 | US4010050 Processing for aluminum nitride inhibited oriented silicon steel |
| 03/01/1977 | US4009872 Energy-conserving, fast-cooling heat treating furnace |
| 02/22/1977 | US4009112 Ammonium chloride, alkali and alkaline earth metal chlorides, fluorides, or bromides |
| 02/15/1977 | US4008163 Method of preparing a saturated fluid mixture |
| 02/08/1977 | US4007351 System for installing high strength steel belts |
| 02/01/1977 | US4006042 Method of and apparatus for hardening workpieces of steel |
| 01/18/1977 | US4003763 Method of and plant for patenting steel wire bundles |
| 12/21/1976 | US3998441 Furnace for tempering and hardening workpieces |
| 12/14/1976 | US3997376 Spray mist cooling method |
| 12/14/1976 | US3997375 Steel hardening method |
| 12/14/1976 | US3997299 Apparatus for producing protective gas |
| 12/07/1976 | US3996076 Metals |
| 12/07/1976 | US3995665 Thermal insulation element |
| 11/30/1976 | US3994678 Heater for billets |
| 11/30/1976 | US3994252 Method for the production of black plate with improved surface lubricity |
| 11/16/1976 | US3992231 Quenching |
| 11/16/1976 | US3991942 Long-range nozzle |
| 11/09/1976 | US3990257 Method for cooling workpieces in a liquid bath |
| 11/02/1976 | US3989923 Wire heat treating apparatus |
| 11/02/1976 | US3989231 Heat treatment of steel |
| 11/02/1976 | US3989093 Continuous casting plant for slabs |
| 11/02/1976 | US3988914 Isothermal metal forming apparatus |
| 11/02/1976 | US3988913 Isothermal metal forming apparatus |
| 10/26/1976 | US3988106 Sickle blade heater |
| 10/19/1976 | US3987237 Electric furnace wall construction |
| 10/19/1976 | US3986900 Process for the production and storage of a protective gas for the annealing of steel and other metals |
| 10/19/1976 | US3986710 Quench unit for inductively heated workpieces |
| 10/12/1976 | US3985583 Method for forming an insulating coating on an oriented silicon steel sheet |
| 10/12/1976 | US3985514 Hot rolled composite billet for nuclear control rods |
| 10/05/1976 | US3983931 Method and apparatus for transferring heat to or from material |
| 09/28/1976 | US3983088 Coating for local protection of parts |
| 09/28/1976 | US3982885 Method and arrangement for inhomogeneous annealing of small parts |
| 09/21/1976 | US3981489 Automatic heat treating system |
| 09/21/1976 | US3981350 Apparatus for supporting and cooling a continuously cast product |
| 09/21/1976 | US3981347 Method and apparatus for strand cooling with a flat spray pattern |
| 09/14/1976 | US3980506 Process for manufacturing highly wear-resistant, undistorted, axially symmetrical parts |
| 08/31/1976 | US3977914 Method of deformation-free quenching of work-pieces heated to hardening temperature |
| 08/24/1976 | US3976518 Process for producing grain-oriented electric steel sheets having remarkably improved magnetic flux density |
| 08/17/1976 | US3975142 Heat shield composition |
| 08/03/1976 | US3972751 Method of heat treating ferrous workpieces |
| 08/03/1976 | US3972744 Method of and means for making lightweight, low cost impact resistant bumpers |
| 08/03/1976 | US3972513 Method and apparatus for treating and annealing ferrous and non-ferrous articles |
| 07/27/1976 | US3971679 Method of annealing oriented silicon steel |
| 07/20/1976 | US3970483 Carbon-manganese-silicon-chromium-molybdenum-vanadium-niobium -iron |
| 07/20/1976 | US3969917 Heat treatment pots |
| 07/13/1976 | US3969162 Method of producing silicon steel strip |
| 07/13/1976 | US3969157 Method of providing decarbonization protection for metallic surfaces |
| 07/13/1976 | US3969069 Burner systems for ovens and methods of operating such systems |
| 07/13/1976 | US3968957 Gas carburizing furnace |
| 06/29/1976 | US3967089 Apparatus for the inductive hardening of workpieces rotatable around a rotational axis |
| 06/29/1976 | US3966509 Method for reducing carbon deposits during box annealing |
| 06/29/1976 | US3966508 Treating waste discharge liquids from metal hardening baths, particularly containing nitrite and nitrate compounds |
| 06/22/1976 | US3965360 Method for discriminating high-temperature red heated material |
| 06/22/1976 | US3964734 Apparatus for thermally treating metal components |
| 06/15/1976 | US3963535 Hot steel |
| 06/15/1976 | US3963534 Zircaloy |
| 06/15/1976 | US3963533 Low temperature magnetic treatment of ferromagnetic materials |
| 06/08/1976 | US3961777 Apparatus for the regulated cooling of hot objects for quenching or hardening purposes |
| 05/25/1976 | US3959034 Method of providing an object of silicon steel with a heat-resistant, electrically insulating coating |
| 05/25/1976 | US3959028 Process of working metals coated with a protective coating |
| 05/25/1976 | US3958918 Method for elimination of furnace roll pickup marks on silicon containing sheet steel |
| 05/25/1976 | US3958796 Quench-hardening of pipes |
| 05/18/1976 | US3957673 Chromium trioxide, silica, water glass |
| 05/18/1976 | US3957257 Hardening apparatus with a hardening tank, especially in hardening machines for crankshafts |
| 05/18/1976 | US3957111 Apparatus for cooling solids of high temperature |
| 05/11/1976 | US3956029 Annealing separator for heat treatment of silicon steel sheets |
| 05/11/1976 | US3956028 Magnesium and boron oxides, carbon |
| 05/11/1976 | US3955972 Method of producing sheets and article to practice such method |
| 05/04/1976 | US3954133 Spheroidal graphite cast iron pipe of ferritic structure and method of producing the same |
| 04/27/1976 | US3953675 Audio speaker system |
| 04/27/1976 | US3953248 Method and apparatus for reclaiming heat treating salt |
| 04/27/1976 | US3953247 Method for heat treatment of material to be worked on, especially of aluminium or magnesium alloys |
| 04/27/1976 | US3953178 Coated metal product |
| 04/27/1976 | US3952571 Method of manufacturing aluminum conductor wires |
| 04/20/1976 | US3951696 Method for producing a high-strength cold rolled steel sheet having excellent press-formability |
| 04/20/1976 | US3951583 Rocking-beam type furnaces |
| 04/13/1976 | US3950575 Steels, protective coatings |