| 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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| 12/01/1981 | CA1113425A1 Ion-nitriding apparatus |
| 12/01/1981 | CA1113354A1 Sintered metal articles |
| 11/18/1981 | EP0040094A1 Carburizing process utilizing atmospheres generated from nitrogen-ethanol based mixtures |
| 11/18/1981 | EP0040023A1 Gas carburizing |
| 11/18/1981 | EP0039852A2 Process and plant for carrying out a Rankine process |
| 11/11/1981 | EP0039659A1 Method for the production of black surfaces on metal |
| 11/11/1981 | EP0039406A2 Process for plasma oxidizing substrates |
| 11/10/1981 | CA1112138A1 Method of surface hardening stainless steel parts |
| 11/03/1981 | US4298265 Light-intercepting device in a camera |
| 10/13/1981 | US4294630 Method and apparatus for the continuous furnace brazing and soft-nitriding treatments of iron articles |
| 10/13/1981 | US4294436 Furnace with protective atmosphere for heating metals |
| 10/06/1981 | CA1110201A2 Ion-nitriding apparatus |
| 09/29/1981 | US4292094 Process for increasing the corrosion resistance of nitrided structural parts made of iron material |
| 09/15/1981 | US4289545 Boron carbide powder, gas flow of trifluoroboroxole |
| 09/08/1981 | US4288062 Apparatus for control and monitoring of the carbon potential of an atmosphere in a heat-processing furnace |
| 09/08/1981 | CA1108398A1 Jet recirculation method for vacuum carburizing |
| 09/02/1981 | EP0034761A2 Method for the surface improvement of machine parts and cutting tools of ferrous alloys |
| 08/12/1981 | EP0033403A1 Method of treating the surfaces of high carbon steel bodies and bodies of high carbon steel |
| 08/04/1981 | US4281824 Heat treating apparatus |
| 08/04/1981 | CA1106242A1 Method for providing a diffusion barrier |
| 07/28/1981 | CA1105783A1 Boronizing-resistant removable polymeric paints |
| 07/21/1981 | US4279782 Application of an alumina coating to oxide whisker-covered surface on Al-containing stainless steel foil |
| 07/21/1981 | US4279528 Tulip member for a tripod joint and process for producing the same |
| 07/21/1981 | US4279406 Plant for generating an atmosphere for the heat treatment of metals |
| 07/07/1981 | US4277517 Diffusion, dopes, oxidation to form electroconductor pattern in dielectric material |
| 07/01/1981 | EP0031034A1 Process for the adjustable carburizing or heating in a protective gas of steel work pieces |
| 06/30/1981 | US4276096 Method for producing hard metal bodies of increased wear resistance |
| 06/09/1981 | US4272306 Carburizing tub apparatus and method |
| 06/09/1981 | US4272239 Direct heating of heat treat furnace chamber |
| 06/02/1981 | US4271239 Sintered metal articles and process for their manufacture |
| 05/19/1981 | US4268535 Gallium arsenide, calcium oxide |
| 05/19/1981 | US4268324 Fabrication of spectrally selective solar surfaces by the thermal treatment of austenitic stainless steel AISI 321 |
| 05/19/1981 | US4268323 Process for case hardening steel |
| 05/12/1981 | US4267205 By heating in a vapor mixture containing iodine and water |
| 05/12/1981 | US4266987 Process for providing acid-resistant oxide layers on alloys |
| 05/05/1981 | US4265730 Surface treating apparatus utilizing plasma generated by microwave discharge |
| 04/28/1981 | US4264380 Nitride casehardening process and the nitrided product thereof |
| 04/21/1981 | US4263060 Removal natural oxide layer, oxidizing in evaluated container |
| 04/14/1981 | US4261769 Steel, resistant to cracking or breaking by vibration |
| 04/14/1981 | CA1099203A1 Process for carburizing steel |
| 04/02/1981 | WO1981000859A1 Carburizing tub apparatus and method |
| 03/11/1981 | EP0024802A1 A method of forming a corrosion resistant coating on a metal article |
| 03/10/1981 | US4255495 Corrosion resistant thermal barrier coating |
| 02/25/1981 | EP0024106A1 Method of heat treating ferrous workpieces |
| 02/10/1981 | US4249966 Method of forming a forsterite insulating film on the surface of a grain-oriented silicon steel sheet |
| 02/10/1981 | US4249965 For carburizing processes; containing nitrogen, hydrogen and carbon monoxide; catalytic cracking of vaporized methanol |
| 02/10/1981 | US4249964 Process for the chemical and thermal treatment of steel parts to improve the strength properties thereof |
| 02/03/1981 | US4248836 Recovery of nuclear fuel material |
| 02/03/1981 | CA1197981B Fluidized bed |
| 02/03/1981 | CA1094802A1 Fluidised bed |
| 01/27/1981 | CA1094316A1 Heat treatment |
| 01/13/1981 | US4244751 Method for melt nitriding of aluminum or its alloy |
| 01/13/1981 | CA1093435A1 Metallurgical treatment using a glow discharge |
| 01/07/1981 | EP0021208A1 System for monitoring the constitution of the atmosphere of a heat-treating furnace |
| 01/06/1981 | CA1092954A1 Heating workpieces by high current intensity glow discharge |
| 12/30/1980 | US4242151 Chromizing of steels by gaseous method |
| 12/23/1980 | US4240682 Bearing race |
| 12/11/1980 | WO1980002698A1 Control of the composition of the atmosphere of a heat treatment oven |
| 12/02/1980 | US4236942 Method for the gaseous nitriding of ferrous-based components |
| 12/02/1980 | US4236941 From air and ethanol oxidized to hydrogen, carbon monoxide, carbon dioxide, methane and water which is soot-free and useable to carburize metals |
| 11/18/1980 | US4234337 Method of producing sintered friction laminae |
| 11/11/1980 | US4233298 Esters of p-carbonylphenoxy-isobutyric acids |
| 11/11/1980 | US4233086 In a copper lined zirconium alloy tube by exposing to steam, oxidizing the zirconium but not the copper |
| 11/11/1980 | US4232852 Apparatus for control of the carburization of parts in a vacuum furnace |
| 11/04/1980 | US4232057 Semiconductor plasma oxidation |
| 10/29/1980 | EP0018263A1 Process for chromizing steel articles, and chromized steel articles |
| 10/28/1980 | US4230507 Method for sulfurizing cast iron |
| 10/15/1980 | EP0016909A1 Method of growing plasma oxide on semiconductor substrates and device for carrying out this method |
| 10/14/1980 | US4227945 Method for preventing decarburization of steel materials |
| 10/14/1980 | CA1087548A1 Apparatus for ion-nitriding |
| 10/07/1980 | US4227032 Power feed through for vacuum electric furnaces |
| 10/01/1980 | EP0016529A1 Improvements in or relating to bearing races |
| 09/30/1980 | US4225744 Fixed thermocouple for vacuum electric furnaces |
| 09/30/1980 | US4225121 Energy efficient heat-treating furnace system |
| 09/17/1980 | EP0015813A1 Process for boronizing articles made of metal or cermet, and articles provided with a boronized surface |
| 09/09/1980 | US4221972 Apparatus for the partial treatment of elongated articles by current intensive glow discharge |
| 08/26/1980 | CA1084392A1 Methods for carburizing steel parts |
| 08/05/1980 | US4216033 Method of nitriding steel |
| 08/05/1980 | CA1083021A1 Method and apparatus for case hardening powdered metal parts |
| 07/23/1980 | EP0013654A1 Process for the heat treatment of steel and for controlling said treatment; steel obtained thereby |
| 07/23/1980 | EP0013644A1 Improvement in ion nitriding elongated hollow steel bodies |
| 07/15/1980 | US4212687 Ion-nitriting process |
| 07/15/1980 | CA1081555A1 Vapor treatment of metal tire cord |
| 07/09/1980 | EP0013063A1 Method of treating the surfaces of high carbon steel bodies |
| 07/08/1980 | US4211584 Adding an acyclic hydrocarbon to the nitrogen or nitrogen-hydrogen atmosphere |
| 06/17/1980 | US4208224 Heat treatment processes utilizing H2 O additions |
| 06/17/1980 | US4208040 Apparatus for the gas carburizing of the bore in an object |
| 06/03/1980 | US4206004 Process of pretreating cold-rolled steel sheet for annealing |
| 05/27/1980 | US4204886 Method for improving and article having improved wear resistance |
| 05/13/1980 | US4202917 Method for manufacture of indium oxide (III) film |
| 05/13/1980 | US4202710 Heat, wear and pitting resistance |
| 05/06/1980 | US4201600 Method for the gas carburization of workpieces made of steel |
| 04/30/1980 | EP0010484A1 Improvement in the chromising of steel in the gaseous phase |
| 04/30/1980 | EP0010138A1 A method of treating aluminium microcircuits |
| 04/29/1980 | US4200805 Multicathode thermochemical processing oven |
| 04/29/1980 | US4200477 Processing for electromagnetic silicon steel |
| 04/01/1980 | US4196022 Diffusion in an alkali metal atmosphere |
| 03/25/1980 | US4194930 Ion-nitriding process |
| 03/18/1980 | US4193825 Method of carbon nitriding a metal workpiece |
| 03/11/1980 | US4193070 Method and arrangement for controlling the electrical relationships of a current-intensive glow discharge |