| Patents for C01B 21 - Nitrogen; Compounds thereof (10,781) |
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| 06/26/1991 | EP0434166A1 Process for preparing fine powders of aluminium nitride from A12O3 and carbon |
| 06/26/1991 | EP0434165A1 Process for preparing fine powders of aluminiumnitride |
| 06/26/1991 | EP0433880A1 Process for reprocessing aqueous mother liquors containing hydrochloric acid, sulphuric acid and their hydroxylammonium and ammonium salts |
| 06/26/1991 | EP0433398A1 Boron nitride of high hardness. |
| 06/26/1991 | EP0433324A1 Process for recovering nitrogen from gaseous mixtures containing oxygen and nitrogen by alternating pressure adsorption on carbon molecular sieves. |
| 06/25/1991 | US5026532 Batch processing, heating mixture of aluminum, sodium and potassium hydroxide, tetramethylammonium hydroxide and silica source |
| 06/19/1991 | EP0432820A2 Laser deposition of crystalline boron nitride films |
| 06/19/1991 | CN1052304A Process for vaporizing hydrazine hydrate solution |
| 06/16/1991 | WO1991008823A1 Process for obtaining nitrogen from air or nitrogen-containing gases by pressure exchange adsorption on carbon molecular sieves |
| 06/13/1991 | WO1991008322A1 Process for chemical vapor deposition of transition metal nitrides |
| 06/12/1991 | EP0432007A1 Monodisperse hexagonal boron nitride having high purity with respect to metals and oxygen and its preparation process |
| 06/12/1991 | EP0431998A1 Process for evaporation of a hydrazine hydrate solution |
| 06/12/1991 | EP0431927A1 Method for producing aluminium nitride by carbothermal reduction and apparatus |
| 06/12/1991 | CN1012799B Process for separating nitrogen from mixtures |
| 06/11/1991 | US5023213 Transition metal bound to inorganic amide or imide ligand and acetylide ligand |
| 06/09/1991 | CA2031834A1 Monodispersed hexagonal boron nitride of high purity with respect to metals and oxygen and preparation process thereof |
| 06/08/1991 | CA2031629A1 Continuous carbothermal reactor |
| 06/05/1991 | EP0430658A2 Chemical heat source comprising metal nitride, metal oxide and carbon |
| 06/04/1991 | US5021533 Intermediate for silicon nitride ceramics |
| 06/04/1991 | US5021371 Pyrolyzing polyborazine in ammonia |
| 06/04/1991 | US5021370 Reacting infusible polysilane fibers with ammonia, then heat treatment yields fibers containing silicon, carbon, nitrogen, oxygen |
| 06/04/1991 | US5021368 Novel ceramic-metal compounds |
| 06/04/1991 | US5021134 Production of nitrogen compounds |
| 05/29/1991 | CN1012678B Method for preparating basically pure and colourless n-(dichlor-phosphoryl) trichlorophosphnitrile |
| 05/28/1991 | US5019220 Forming alkaline slurry; adding oxidizer and azide |
| 05/28/1991 | US5019143 Low pressure noncryogenic processing for ethylene recovery |
| 05/22/1991 | EP0428242A2 Azide gas generating composition for inflatable devices |
| 05/22/1991 | CN1051567A Process for regulating molecular mass of polydichlorophosphazene |
| 05/22/1991 | CN1051563A Process for neutralizing harmful effects of impurites of n-dichlorophosphoryl trich-lorophosphazene and polycondensates thereof |
| 05/21/1991 | WO1991007524A1 Method of separating dinitrogen pentoxide from its solution in nitric acid |
| 05/21/1991 | US5017640 Controlled polymerization of silazane monomers |
| 05/21/1991 | US5017529 Process for making ceramic materials |
| 05/21/1991 | US5017525 Organometallic or other polymer |
| 05/21/1991 | US5017348 Forming nitric and nitrous acids |
| 05/21/1991 | CA1284309C Electrodialytic recovery of mixed acids from mixed salts including fluoride anion |
| 05/15/1991 | EP0427620A1 Process for the separation of a gas from a gas mixture using metal complexes of cyclic polynitrogenated derivatives |
| 05/14/1991 | US5015455 Disulfonate process control |
| 05/14/1991 | US5015411 Process, composition, and apparatus for purifying inert gases to remove Lewis acid and oxidant impurities therefrom |
| 05/14/1991 | US5015271 Separation of gas mixtures by vacuum swing adsorption (VSA) in a two-adsorber system |
| 05/14/1991 | US5015265 Process for making cubic boron nitride from coated hexagonal boron nitride, and abrasive particles and articles made therefrom |
| 05/10/1991 | CA2029455A1 Process for the separation of a gas from a gas mixture using metal complexes of cyclic polynitrogenated derivatives |
| 05/08/1991 | EP0425825A1 Nitride products and method and apparatus for their production |
| 05/08/1991 | EP0425668A1 Method and reactor for obtaining powdered refractory material |
| 05/08/1991 | CN1051153A Method for making ultrafine powder of silicon nitride by dual-tube pressuring |
| 05/04/1991 | CA2029010A1 System for the efficient reduction of nitrogen oxides in an effluent |
| 05/01/1991 | CA2027493A1 Process for the manufacture of friable silicon nitride bodies |
| 04/24/1991 | EP0424236A1 Process for the neutralisation of the unfavourable effects of the impurities of N-dichlorophosphoryl trichlorophosphazene and of its polycondensate |
| 04/24/1991 | EP0424235A1 Process for the molecular weight control of polydichlorophosphazenes |
| 04/24/1991 | EP0424094A1 Process for producing a stable, purified boron nitride powder and product produced thereby |
| 04/24/1991 | EP0423610A1 Methods of preserving, storing and using hydroxylamine production catalyst |
| 04/24/1991 | EP0308409B1 Process for producing carbon molecular sieves |
| 04/24/1991 | CN1012419B Integrated pressure swing adsorption / membrane separation |
| 04/21/1991 | CA2028185A1 Process for the regulation of polydichlorophosphazene molecular weights |
| 04/21/1991 | CA2028184A1 Neutralization process for adverse effects of impurities of n-dichlorophosphoryl trichlorophosphazene and polycondensate thereof |
| 04/20/1991 | CA2011037A1 Composite material of boron nitride and method for the preparation thereof |
| 04/18/1991 | WO1991004942A1 Process for purifying nitrogen trifluoride gas |
| 04/16/1991 | US5008229 Accelerates condensation and/or equilibrium of organosiloxanes |
| 04/09/1991 | US5006325 Process for the recovery of nitric acid |
| 04/09/1991 | US5006324 Polymerization of phosphonitrilic chloride |
| 04/03/1991 | EP0420718A1 Process for the preparation of metallic nitrides |
| 04/02/1991 | US5004708 Pyrolytic boron nitride with columnar crystalline morphology |
| 04/02/1991 | US5004482 Production of dry, high purity nitrogen |
| 04/02/1991 | CA1282533C Organopolysilazane composition containing free radicals and curable by heat supply |
| 03/26/1991 | US5002646 Method for making titanium nitride |
| 03/20/1991 | EP0417253A1 Low temperature method of forming materials using one or more metal reactants and a halogen-containing reactant to form one or more reactive intermediates |
| 03/19/1991 | US5001090 Silicon nitride ceramics from isocyanate- and isothiocyanate-modified polysilazanes |
| 03/19/1991 | CA1281838C Cross-linked organosilazane polymers |
| 03/12/1991 | US4999095 Recovery of mixed acids from mixed salts |
| 03/12/1991 | CA1281477C Method for converting si-h containing polysiloxanes to new and useful preceramic polymers and ceramic materials |
| 03/06/1991 | EP0415354A2 Process for the recovery of nitric acid |
| 03/05/1991 | US4997635 Preparation of crystalline hydroxylammonium sulfate having a low ammonium sulfate content |
| 03/05/1991 | US4997633 Water-soluble boron containing impurity reduced hexagonally crystalline boron nitride |
| 03/05/1991 | CA1280873C Method of synthesizing amorphous group iiia-va compounds |
| 03/05/1991 | CA1280858C Comminuting and rapidly solidifying particles of metalloids and additive metal |
| 02/26/1991 | US4996174 Production of ceramic materials |
| 02/26/1991 | US4996036 Adding nitrogen dioxide to emission gases, contacting with aqueous alkali solution |
| 02/26/1991 | US4996035 Preparation of nitrosyl fluoride |
| 02/26/1991 | US4996030 Removing toxic arsine, phosphine, diborane and hydrogen selenide using cupric oxide, manganese dioxide and silicon, aluminum or zinc oxides |
| 02/21/1991 | WO1991001953A1 Aluminum nitride powder, production thereof, and molding composition containing the same |
| 02/19/1991 | US4994107 Varying temperature, homogeneous nucleation |
| 02/13/1991 | EP0412663A2 Gas separation apparatus with multiple head pumping |
| 02/12/1991 | US4992523 Copolymers containing si-n and si-si bonds, polycarbosilazanes obtained by pyrolysis of the said copolymers, and use of the said polycarbosilazanes for the preparation of silicon carbonitride |
| 02/12/1991 | US4992253 Adding 1 to 5 % by weight of aluminum nitride to a mixture of alumina and carbon black, heating in the presence of nitrogen |
| 02/12/1991 | US4992252 Catalytic hydrogenation of nitrogen monoxide in presence or platinum containing catalysts |
| 02/12/1991 | US4992249 Injecting dispersion of dilute aqueous solution into effluent from oxygen-rich combustion of carbonaceous fuel |
| 02/07/1991 | DE3925296A1 Trace impurity removal from inert or noble gas - using successive packings of metal, esp. calcium, and hydride storage material |
| 02/06/1991 | EP0411254A1 Production of dry, high purity nitrogen |
| 02/05/1991 | US4990471 Carbonization of organic polymer with dispersed silica fines, then heat-treating with oxides of aluminum, boron or yttrium; purity |
| 01/30/1991 | EP0410459A2 Preparation of silicon nitride powder |
| 01/30/1991 | EP0410269A1 Membrane consisting of silicon carbide and silicon nitride, method for the preparation thereof and mask for X-ray lithography utilizing the same |
| 01/30/1991 | EP0410107A2 Process for the preparation of silicon dimide with a low carbon content |
| 01/29/1991 | US4988490 Combustion of hydrocarbons to form flue gas, separation to recover nitrogen, condensation |
| 01/29/1991 | US4987742 Process for the generation of mechanical energy in the ammonia oxidation step of a nitric acid production process |
| 01/24/1991 | WO1991000842A1 Manufacture of aluminium nitride |
| 01/23/1991 | EP0409135A1 Improved chabazite for gas separation |
| 01/23/1991 | EP0381720A4 Low pressure noncryogenic processing for ethylene recovery |
| 01/23/1991 | CN1048691A Electronic device for fertilizing fresh water |
| 01/23/1991 | CN1048684A Improved process and system for production of dry high purity nitrogen |
| 01/23/1991 | CN1048683A Dry, high purity nitrogen production process and system |
| 01/22/1991 | US4987104 Method of forming a ceramic product |