| Patents for C01B 21 - Nitrogen; Compounds thereof (10,781) |
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| 08/29/1990 | CN1009355B Generation process and apparatus of insert gas |
| 08/22/1990 | EP0383122A1 Process for the preparation of aquous metal nitrate solutions |
| 08/21/1990 | US4950626 Production of ceramic materials |
| 08/21/1990 | US4950419 Process, composition, and apparatus for purifying inert gases to remove lewis acid and oxidant impurities therefrom |
| 08/21/1990 | US4950315 Multiple head pumping |
| 08/17/1990 | CA2009667A1 Process for the preparation of metal nitrates |
| 08/16/1990 | EP0381826A1 Process for the production of mechanical energy during the NH3 oxidation in the HNO3 process |
| 08/16/1990 | EP0381825A1 Process for the production of mechanical energy during the NH3 oxidation in the HNO3 process |
| 08/16/1990 | EP0381720A1 Low pressure noncryogenic processing for ethylene recovery. |
| 08/16/1990 | DE3903661A1 Method of reprocessing waste acid containing nitric and sulphuric acid |
| 08/14/1990 | US4948762 Reacting a metal halide compound with an alcohol; thermally decomposing and nitriding reaction product |
| 08/14/1990 | US4948571 Process for purifying nitrogen trifluoride gas |
| 08/14/1990 | CA1272740A1 Production of ceramic materials |
| 08/08/1990 | EP0395746A4 Process for making transition metal nitride whiskers. |
| 08/08/1990 | EP0381204A1 Compositions containing phosphoronitride chloride |
| 08/08/1990 | EP0380723A1 Process for separating nitrogen gas by pressure swing adsorption system |
| 08/07/1990 | US4946920 Polysilazanes, processes for their preparation, ceramic materials which contain silicon nitride and can be prepared from them, and preparation thereof |
| 08/07/1990 | US4946814 Adding an acid stable anionic fluoroarbon surfactant to slurry then spray drying |
| 08/07/1990 | US4946809 Precursor for A1NBN ceramic and method of use |
| 08/07/1990 | US4946713 Poly(alkenylpentaborane) ceramic precursors |
| 08/07/1990 | US4946662 Method of forming condensed phosphates in aqueous solutions |
| 08/07/1990 | US4946630 Making hot pressed silicon nitride by use of low density reaction bonded body |
| 08/01/1990 | EP0379910A1 Process for the preparation of powdery metal nitrides |
| 08/01/1990 | CN1044272A Sinterable ceramic powder and process of preparation thereof, silicon nitride ceramic obtained from ceramic powder and preparation and uses thereof |
| 07/31/1990 | US4944931 Reacting nitrosyl sulfuric acid with hydrogen fluoride |
| 07/31/1990 | US4944930 Synthesis of fine-grained α-silicon nitride by a combustion process |
| 07/31/1990 | CA1272221A1 Aluminum nitride/aluminum oxynitride/group ivb metal nitride abrasive particles derived from a sol-gel process |
| 07/26/1990 | WO1990007971A1 Sorption of gaseous compounds of groups ii-vii elements |
| 07/26/1990 | DE3901725A1 Process for preparing pulverulent metal nitrides |
| 07/25/1990 | EP0379359A2 A composite material |
| 07/25/1990 | EP0378761A1 Abatement of NOx from hydroxylamine disulfonate process |
| 07/25/1990 | EP0378760A1 Disulfonate process control |
| 07/18/1990 | EP0377751A1 Method of obtaining silicon nitride with high alpha-phase content |
| 07/17/1990 | CA1271710A1 Process for producing high concentration oxygen by a pressure-swing-absorption method |
| 07/11/1990 | EP0377424A2 Process for capturing nitrogen from air using gas separation membranes |
| 07/11/1990 | EP0377132A1 Process for the production of silicon nitride |
| 07/11/1990 | EP0215899B1 Enhanced pressure swing adsorption processing |
| 07/11/1990 | CN1043722A Polysubstitution oligosilazane and process of preparation |
| 07/11/1990 | CN1043682A Fixation of nitrogen by discharge after heating air and water |
| 07/11/1990 | CN1008723B Process for making titanium nitride powder |
| 07/03/1990 | US4938838 With hydrogen peroxide |
| 06/27/1990 | EP0375477A1 Process for producing an atmosphere for thermal treatment by air separation by permeation |
| 06/27/1990 | EP0374955A1 Method of producing beta-sialon fine powder |
| 06/27/1990 | EP0374631A2 Process for the oxygen concentration in air by means of vacuum-swing-adsorption using mixtures of CA-zeolit A molecular sieves |
| 06/27/1990 | EP0282561B1 Catalytic process for making compounds having a non-lewis acid/base group iiia metal to group va nonmetal bond |
| 06/21/1990 | CA2005988A1 Process for the absorptive oxygen-enrichment of air with mixtures of ca zeolite a molecular sieves by means of vacuum swing absorption |
| 06/20/1990 | CN1043089A Method for purification of acids from materials comprising acid and salt |
| 06/19/1990 | US4935214 Process for producing high purity silicon nitride by the direct reaction between elemental silicon and nitrogen-hydrogen liquid reactants |
| 06/19/1990 | US4934148 Dry, high purity nitrogen production process and system |
| 06/19/1990 | CA1270365A1 Method for producing aluminum nitride powder |
| 06/14/1990 | WO1990006168A1 Method for purification of acids from materials comprising acid and salt |
| 06/13/1990 | EP0372691A1 Production of aluminium nitride powder by carboreductive nitridation |
| 06/13/1990 | EP0372382A2 Sinterable ceramic powder, method of making same, a silicon nitride ceramic material made thereof, method of making them and their use |
| 06/13/1990 | EP0372380A2 Polysubstituted oligosilazanes and methods for their preparation |
| 06/13/1990 | DE3937413A1 High purity silicon nitride prodn. - by reacting silicon powder with nitrogen to obtain porous granulate |
| 06/12/1990 | US4933314 Molecular sieving carbon |
| 06/12/1990 | US4933158 Thermally treating natural zeolite, forming packed bed of zeolite, passing gas through |
| 06/12/1990 | CA1270208A1 Selective adsorption process |
| 06/06/1990 | EP0371846A1 Process for the preparation of silicon carbonitrides from polycarbosilanes |
| 06/06/1990 | EP0371771A2 Process for preparing aluminium nitride and aluminium nitride so produced |
| 06/05/1990 | USH787 Carbohydrazinium dinitrate |
| 06/05/1990 | US4931111 Azide gas generating composition for inflatable devices |
| 06/05/1990 | US4931070 Process and system for the production of dry, high purity nitrogen |
| 06/05/1990 | US4930319 Sublimation method |
| 06/03/1990 | CA2004403A1 Sinterable ceramic powder, process for its preparation, silicon nitride ceramic manufactured therefrom, process for its manufacture and its use |
| 06/03/1990 | CA2004402A1 Polysubstituted oligosilazanes and process for their preparation |
| 05/30/1990 | EP0370878A1 Process for the preparation of silicon nitride from polycarbosilanes |
| 05/30/1990 | EP0370872A1 Process for producing an atmosphere for thermal treatment by air separation by adsorption |
| 05/30/1990 | EP0370848A1 Gallium nitride and oxynitrides useful as selective detectors for reducing gases in the atmosphere, process for their preparation and a detecting apparatus containing them |
| 05/29/1990 | US4929704 Ammonia reacted with halosilanes, ammonolysis, with isocyanate, isothiocyanate |
| 05/29/1990 | US4929433 Metal nitrides from solutions |
| 05/29/1990 | US4929432 Process for producing crystalline silicon nitride powder |
| 05/29/1990 | CA2004172A1 Process for preparing aluminum nitride and aluminum nitride so produced |
| 05/24/1990 | CA2003473A1 Method for controlling atmosphere in heat treatment process by way of permeation |
| 05/24/1990 | CA2003472A1 Method for controlling atmosphere in heat treatment process by way of adsorption |
| 05/23/1990 | CN1042312A Integrated pressure swing adsorption / membrane separation |
| 05/22/1990 | US4927461 Machinable-grade, ferrous powder blend containing boron nitride and method thereof |
| 05/17/1990 | WO1990005000A1 Devices and method for cleaning gases |
| 05/16/1990 | EP0368688A1 Polymers containing nitrogen and boron, their preparation and their use as boron nitride precursors |
| 05/15/1990 | US4925461 Process for separating nitrogen gas by pressure swing adsorption system |
| 05/15/1990 | US4925460 Adsorption; lithium exchanged |
| 05/09/1990 | CN1041959A Method of controlled catalytic polymerization of composition polysilazane |
| 05/09/1990 | CN1007888B Silicon nitride powders for ceramics by carbothermic reduction and process for manufacture thereof |
| 05/08/1990 | US4923691 Melting aluminum and monoamminealuminum chlroide adding ammonia |
| 05/08/1990 | US4923689 Heat treatment and coating with organic phosphoric acid |
| 05/02/1990 | EP0366078A2 Method for Purifying nitrogen trifluoride gas |
| 05/01/1990 | US4921657 Method for densification of amorphous ceramic material |
| 05/01/1990 | US4921655 Preparation of compact, crystalline and pore-free moldings from oxide ceramic |
| 05/01/1990 | US4921531 Process for forming fine ceramic powders |
| 05/01/1990 | US4920743 Crash bag propellant composition and method for generating nitrogen gas |
| 04/25/1990 | EP0365490A1 Apparatus and method for the removal of impurity gases from inert gases and the ensurance of extremely low levels of hydrogen |
| 04/25/1990 | EP0365295A1 Process for producing crystalline silicon nitride powder |
| 04/25/1990 | EP0364573A1 Electrochemically controlled superconductivity |
| 04/25/1990 | EP0240530B1 Particulate compositions of ferromagnetic metal oxalates in the form of submicronic needle shaped particles, preparation and application thereof |
| 04/25/1990 | CN1041604A Synthetic method of polymers of boracium and nitrogen based on boron nitride precursor and products obtained |
| 04/25/1990 | CN1041554A Process for making compositions of powdery refractory inorganic compounds and metals |
| 04/25/1990 | CN1007724B Method of producing alpha-silicon nitride powders |
| 04/24/1990 | US4920117 Analgesics, treatment of memory dysfunctions; alzheimer's disease |
| 04/24/1990 | CA1268165A1 Catalyst for decreasing the content of nitrogen oxides in flue gases |
| 04/24/1990 | CA1268018A1 Catalyst for decreasing the content of nitrogen oxides in flue gases |