| Patents for C01B 21 - Nitrogen; Compounds thereof (10,781) |
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| 04/19/1990 | WO1990004268A1 Apparatus to provide oxygen-free gas |
| 04/19/1990 | CA2000949A1 Process for producing crystalline silicon nitride powder |
| 04/18/1990 | EP0364338A1 Process for controlling the catalytic polymerisation of a polysilazane composition |
| 04/18/1990 | EP0364323A2 Process for the preparation of polymers containing boron and nitrogen as precursors of boron nitride, and products obtained |
| 04/18/1990 | EP0364153A1 Metal fabrics |
| 04/18/1990 | CN1041333A Method and equipment for preparing nitrogen by pressure-changing absorption |
| 04/17/1990 | US4917877 Process for producing aluminum nitride powder |
| 04/17/1990 | CA1267882A1 Catalyst for decreasing the content of nitrogen oxides in flue gases |
| 04/17/1990 | CA1267880A1 Catalyst for decreasing the content of nitrogen oxides in flue gases |
| 04/12/1990 | CA2000349A1 Metal fabrics |
| 04/11/1990 | EP0362605A2 Process for the preparation of finely divided carbides and nitrides from ceramic precursor compounds |
| 04/11/1990 | EP0220202B1 Recovery of mixed acids from mixed salts |
| 04/11/1990 | CN1041114A Method for gas separation using helically wound hollow fibers permeable membrane cartridge |
| 04/10/1990 | US4916093 Method of producing continuous inorganic fiber consisting of Si, N and O |
| 04/10/1990 | US4915915 Electric arc |
| 04/04/1990 | EP0361542A1 Composite articles and process for their production |
| 04/04/1990 | EP0361541A2 Pressure swing adsorption process |
| 04/04/1990 | EP0361061A1 Silicium nitride powders having particular surface properties, and methods for their preparation |
| 04/03/1990 | US4914063 Reacting high purity silicon particles and amines in liquid phase |
| 04/03/1990 | US4913887 Production of boron nitride |
| 03/28/1990 | EP0360305A2 Process for producing particles of a composite material, and their use |
| 03/27/1990 | US4911870 Heating silicon dioxide and carbon powder in nitrogen atmosphere |
| 03/27/1990 | US4911800 Electrochemically controlled superconductivity |
| 03/22/1990 | WO1990002705A1 PROCESS FOR PRODUCING β-SIALON POWDER |
| 03/22/1990 | WO1990002704A1 Boron nitride of high hardness |
| 03/22/1990 | WO1990002599A1 Process for recovering nitrogen from gaseous mixtures containing oxygen and nitrogen by alternating pressure adsorption on carbon molecular sieves |
| 03/21/1990 | EP0359286A2 Method by reduction of nitrogen oxide |
| 03/21/1990 | EP0359175A1 Method for gas sepration using helically wound hollow fibers permeable membrane cartridge |
| 03/21/1990 | EP0358975A2 Silicon nitride powder having a low oxygen content |
| 03/21/1990 | CN1040559A Method and facility for producing silicon nitride powder |
| 03/20/1990 | US4910002 Cyclic process for the removal of NOx and SOx from gas streams using a water-soluble, polymeric chelate of a polyvalent metal and membrane separation means |
| 03/20/1990 | US4909973 Method for refining non-oxide ceramic powders |
| 03/20/1990 | CA1266759A1 No reduction using sublimation of cyanuric acid |
| 03/14/1990 | EP0358012A2 Silicium nitride powders having a low isoelectric point, and methods for their preparation |
| 03/13/1990 | US4908270 Blending nitrite and hydrogen fluoride into nitrosyl fluoride solution where hydrogen fluoride and nitrite adding areas are spaced away from each other, avoiding violent reaction between them |
| 03/13/1990 | US4908197 Aluminum nitride flakes and spheres |
| 03/13/1990 | US4908171 Grinding silicon nitride using zirconium oxide or silicate grinding bodies, forming powder compact, heating, sintering |
| 03/13/1990 | US4908114 Mobile atom insertion reaction, mobile atom transmissive membrane for carrying out the reaction, and reactor incorporating the mobile atom transmissive membrane |
| 03/07/1990 | EP0356861A2 Separation of gas mixtures by vacuum swing adsorption (VSA) in a two-adsorber-system |
| 03/06/1990 | US4906763 Boron nitride preceramic polymers |
| 03/06/1990 | US4906493 Method of preparing coatings of metal carbides and the like |
| 02/28/1990 | EP0356267A1 Material based on boron nitride, process of producing the same and use as reinforcing agent |
| 02/28/1990 | EP0355875A1 Method of preparing a gas hydrate clathrate, and sublimation method |
| 02/27/1990 | CA1266163A1 One-step process for purifying an inert gas |
| 02/20/1990 | US4902490 Essentially pure/colorless P2 NOCl5 |
| 02/14/1990 | EP0354259A1 Improved pressure swing adsorption process |
| 02/13/1990 | US4900526 Polycrystalline rhombohedral boron nitride and method of producing the same |
| 02/07/1990 | EP0353794A1 Process and apparatus for the preparation of fine-grained lead azide |
| 02/07/1990 | CN1039448A Ductile alloy |
| 02/06/1990 | USH736 Process for making boron nitride using sodium cyanide and boron |
| 01/31/1990 | EP0353052A2 Process for producing fibres composed of or coated with carbides or nitrides |
| 01/31/1990 | CN1006631B Method of nitric acid production through nitrogen fixation with air at low temp. and low pressure |
| 01/24/1990 | EP0351747A2 Method of making a ceramic material containing silicon nitride from polymeric hydridochlorosilazanes |
| 01/24/1990 | CN1039011A Boric nitride material, process for preparing it, and utilization of it as reinforing agent |
| 01/23/1990 | US4895711 Nitrogen monoxide, hydrogen, mineral acid, platinum catalyst, supports, platinum salt reduction, thiourea |
| 01/23/1990 | US4895710 High pressure, oil wells |
| 01/23/1990 | US4895709 Low temperature pyrolysis |
| 01/17/1990 | EP0350656A2 Inert gas purifier especially suited for bulk nitrogen without the use of hydrogen or other reducing gases |
| 01/17/1990 | CN1038797A Improved mambrane separation system and process |
| 01/16/1990 | US4894068 Process for capturing nitrogen from air using gas separation membranes |
| 01/10/1990 | EP0350373A1 Process for treating a gas mixture by adsorption |
| 01/09/1990 | US4892791 Body coated with cubic boron nitride & method for manufacturing the same |
| 01/09/1990 | US4892625 Method for producing high purity chemicals |
| 01/09/1990 | US4892565 Adsorptive separation utilizing multiple adsorption beds |
| 01/02/1990 | US4891339 Carbides and nitrides of silicon and boron |
| 12/28/1989 | WO1989012794A1 Low pressure noncryogenic processing for ethylene recovery |
| 12/28/1989 | DE3914296A1 Aluminium nitride powder and a process for the preparation thereof |
| 12/27/1989 | EP0347566A2 Aluminium nitride powder and process of its preparation |
| 12/27/1989 | CN1038250A Process for prepn. of high content of alpha-phase silicon nitride |
| 12/27/1989 | CN1006203B Agent for purification of inert gases from hydrogen and oxygen |
| 12/26/1989 | US4889704 Preparation of hydroxylammonium salts |
| 12/26/1989 | US4889665 Process for producing ultrafine particles of ceramics |
| 12/21/1989 | DE3918212A1 Process and apparatus for recovery of nitrogen oxides from industrial plants |
| 12/19/1989 | US4888159 Process for the preparation of silicon oxynitride-containing products |
| 12/19/1989 | US4888142 Firing amorphous form in nonoxidizing atmosphere |
| 12/19/1989 | CA1263963A1 Thermal process for treating a polysilazane containing = si and = si-n-groups |
| 12/18/1989 | EP0304478A4 Process for nitrogen oxides reduction with minimization of the production of other pollutants. |
| 12/13/1989 | EP0345354A1 Process for purifying nitrogen-fluoride |
| 12/12/1989 | EP0313648A4 Process for nitrogen oxides reduction and minimization of the production of other pollutants. |
| 12/06/1989 | EP0344917A1 Apparatus for the separation of gas mixtures |
| 12/06/1989 | EP0344612A2 Process for purifying nitrogen trifluoride gas |
| 12/06/1989 | EP0344269A1 Process for the reduction of nitrogen oxides in an effluent |
| 11/30/1989 | WO1989011447A1 METHOD OF OBTAINING SILICON NITRIDE WITH HIGH alpha-PHASE CONTENT |
| 11/29/1989 | EP0343921A2 Eta phase materials, methods of producing the same, and use therof as catalysts for alcohol synthesis, hydrocarbon synthesis, hydrocarbon hydrogenation and hydrocarbon converion reactions |
| 11/28/1989 | US4883559 Reduction of transition metal oxide or nitride with cyanide salt |
| 11/28/1989 | US4883515 Processing hydrocarbon gases with selected physical solvents |
| 11/23/1989 | EP0342673A2 Process for producing a shaped boron nitride product |
| 11/23/1989 | DE3806887A1 Production of nitric acid with associated process for cold generation |
| 11/21/1989 | US4882143 To protect from ultraviolet radiation |
| 11/21/1989 | US4882136 Process for the production of transparent aluminum nitride films |
| 11/21/1989 | US4882135 Process for the production of transparent aluminum nitride coatings from ammine salts of aluminum iodides |
| 11/21/1989 | US4881955 Maintaining permeate gas flow countercurrent to feed and raffinate flows; using fibers of uniform length |
| 11/21/1989 | US4881722 Apparatus for producing superfine particle |
| 11/14/1989 | US4880765 Process for producing carbon molecular sieves |
| 11/08/1989 | EP0340907A1 Black titanium nitride and process for its preparation |
| 11/08/1989 | CN1036934A Preparation of hydroxylammonium salts |
| 11/08/1989 | CN1036909A Reactive posttreatment for gas separation membranes |
| 11/07/1989 | EP0259366A4 Polysilazanes and related compositions, processes and uses. |
| 10/31/1989 | US4877743 Monitoring reaction of nitrous oxide to form nitrogen |
| 10/31/1989 | US4877591 Process for the reduction of nitrogen oxides in an effluent using sugar |