| Patents for C23C 8 - Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals (10,951) |
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| 05/31/1977 | US4026734 Method of coating titanium |
| 05/31/1977 | US4026730 Nitrided materials |
| 04/26/1977 | US4019928 Process for nitriding iron and steel in salt baths regenerated with triazine polymers |
| 04/19/1977 | US4019064 High intensity ionic bombardment reactor for thermochemical treatment processes |
| 04/12/1977 | US4017336 Thin submicroscopic oxide film on iron, iron-chromium, and iron-chromium-nickel alloys |
| 04/05/1977 | US4016013 Process for producing diffusion layers of carbides, nitrides and/or carbonitrides |
| 04/05/1977 | US4016012 Method for surface treatment of metallic materials |
| 03/22/1977 | US4013488 Additional layer of chromium, tin, lead, zinc, copper, or cadmium |
| 03/22/1977 | US4013487 Or cobalt-coated steel with carburized interface |
| 03/22/1977 | US4013279 Treatment furnace |
| 03/15/1977 | US4012238 Smoothness |
| 03/08/1977 | US4011107 Boron diffusion coating process |
| 02/15/1977 | US4008163 Method of preparing a saturated fluid mixture |
| 02/01/1977 | US4006043 Method of maintaining at very low values the content of cyanide in salt baths containing cyanates |
| 02/01/1977 | US4006042 Method of and apparatus for hardening workpieces of steel |
| 01/25/1977 | US4004952 Carburized bearing members |
| 01/25/1977 | US4004891 Superalloys containing nitrides and process for producing same |
| 01/18/1977 | US4003764 Preparation of an ε-carbon nitride surface layer on ferrous metal parts |
| 12/28/1976 | US3999953 Molded articles made of a hard metal body and their method of production |
| 12/21/1976 | US3998671 Pressing, sintering, shaping, heat treatment |
| 12/21/1976 | US3998666 Subscale reaction strengthening of low carbon ferrous metal stock |
| 11/30/1976 | US3994750 Method of producing abrasion resistant plastification elements for injection molding machines |
| 11/02/1976 | US3989559 Superalloys containing nitrides and process for producing same |
| 10/12/1976 | US3985917 Method of depositing material on a heated substrate |
| 09/28/1976 | US3983088 Coating for local protection of parts |
| 08/10/1976 | US3973875 Turbine discs and blades for gas turbine engines |
| 07/27/1976 | USRE28918 Components of a rotary piston machine |
| 07/13/1976 | US3969158 Heat treatment |
| 07/13/1976 | US3969153 Method of manufacturing a stainless steel boiler tube with anticorrosive coating |
| 07/13/1976 | US3969151 Treatment of stainless steel and similar alloys to reduce hydrogen outgassing |
| 07/13/1976 | US3968957 Gas carburizing furnace |
| 06/29/1976 | US3966511 Process for the manufacture of anti-abradant elements |
| 06/29/1976 | US3966508 Treating waste discharge liquids from metal hardening baths, particularly containing nitrite and nitrate compounds |
| 06/22/1976 | US3964737 Belleville spring |
| 06/15/1976 | US3963451 Method of forming a high-temperature abrasion-resistant coating on a ferrous metal substrate, and resulting article |
| 06/01/1976 | US3960609 Process for hydriding magnesium based alloys |
| 05/04/1976 | US3954517 Carbon, manganese, silicon, nickel, molybdenum, vanadium, iron |
| 04/27/1976 | US3953571 Process for the treatment of carburizing salt wastes |
| 04/27/1976 | US3953570 Process for the treatment of carburizing salt wastes |
| 04/27/1976 | US3952945 Furnace temperature control system |
| 04/27/1976 | US3952772 Intake piece adapted for emptying containers with liquid |
| 04/13/1976 | US3950490 Process for the treatment of carburizing salt wastes |
| 04/13/1976 | US3950192 Hydrocarbon gas |
| 04/06/1976 | US3949052 Process for the treatment of carburizing salt wastes |
| 03/30/1976 | US3946817 Differentially carburized rock bit cutter |
| 03/16/1976 | US3944443 Ultra high temperature chemical reactions with metals |
| 03/16/1976 | US3943990 Anti-skid and protective chain |
| 03/09/1976 | US3943010 Manganese-chromium-iron-nitrogen |
| 02/17/1976 | US3939293 Method for passivating chromium |
| 02/03/1976 | US3936327 Silicon carbide, alkali metal or ammonium borofluoride, boron-releasing agent |
| 01/27/1976 | US3935034 Cemented carbide, packing with a powder of boron and alumina, silica or zirconia |