Patents
Patents for C01B 21 - Nitrogen; Compounds thereof (10,781)
05/1993
05/25/1993CA1318108C Process for purifying nitrogen trifluoride gas
05/21/1993CA2083093A1 Membrane air drying and separation operations
05/19/1993EP0521849A4 Process, composition, and apparatus for purifying inert gases to remove lewis acid and oxidant impurities therefrom
05/18/1993US5211921 From alloy
05/13/1993DE4205347A1 Wet nitrogen process and assembly - used to generate ultra-clean conditions within a chemical process space
05/12/1993EP0540689A1 Process for nitriding silicon-containing materials
05/12/1993EP0540683A1 Process for making silicon nitride articles.
05/12/1993EP0540671A1 Preparing silicon nitride with densification aid, and results.
05/07/1993CA2055006A1 Fire starting compound and a method of preparing the same
05/05/1993EP0540170A1 Silicon tetrahydrazides and purification of DNA
05/05/1993CN1071640A Process of prepartion of silicon nitride from carbonitriding of silica and whisker-free granular silicon nitride
05/05/1993CN1071602A Platinum alloy for ammonia oxidation catalyzer
05/05/1993CN1020442C Method for making ultrafine powder of silicon nitride by dual-tube pressuring
05/04/1993US5208002 Method of producing alkali metal azides
05/04/1993US5207806 Dual product pressure swing adsorption and membrane operations
05/03/1993CA2081818A1 Process for the oxidative purification of waste gases containing nitrogen oxides
04/1993
04/29/1993WO1993008121A1 PROCESS FOR PREPARING HYDROXYLAMINE FROM NOx-CONTAINING FLUE GASES
04/29/1993DE4135087A1 Regenerating spent aluminium@-contg. nitric acid soln. - from chemical surface treatments of aluminium@ parts, with redn. of effluent nitrate content and recovery of free and combined acid
04/29/1993CA2121133A1 Process for preparing hydroxylamine from nox-containing flue gases
04/28/1993EP0539268A1 Process for removing hydrogen by cryogenic distillation in the production of high purity nitrogen
04/28/1993CN1071346A Dual product pressure swing adsorption process and system
04/28/1993CN1071345A Dual product pressure swing adsorption and membrane operations
04/27/1993US5205127 Cryogenic process for producing ultra high purity nitrogen
04/25/1993CA2081279A1 Process for supplying nitrogen from an on-site plant
04/21/1993EP0537614A1 Dual product pressure swing adsorption and membran operations
04/21/1993EP0537612A1 Dual product pressure swing adsorption process and system
04/21/1993CN1071158A Process of preparation of boron nitride ceramic from derivative precursor of hydrazine
04/20/1993US5204772 Electrically responsive light controlling device
04/20/1993US5204075 Process for the purification of the inert gases
04/20/1993CA1316621C Production of ceramic material and precursor therefor
04/20/1993CA1316330C Process for purifying nitrogen trifluoride gas
04/13/1993US5202096 Apparatus for low temperature purification of gases
04/13/1993US5202057 Steam reforming of hydrocarbons; combining hydrogen and nitrogen
04/13/1993US5201923 Shock wave propagation to develop shock pressure converting hexagonal form to cubic pattern
04/09/1993CA2080087A1 Dual product pressure swing adsorption process and system
04/09/1993CA2080077A1 Dual product pressure swing adsorption and membrane operations
04/08/1993DE4136183C1 Removing nitrous oxide(s) from waste gas - by reacting with hydrogen peroxide in presence of inert solid catalyst, preventing evapn. of soln.
04/07/1993EP0535514A1 Process for the preparation of hydroxylammonium sulfate
04/01/1993WO1993006042A1 Process for low temperature synthesis of nitride powders, especially aluminium nitride
04/01/1993DE4230988A1 Alkali metal azide recovery from gas generating material esp. waste - from vehicle safety bag, mfr. by dissolving in solvent, esp. water to remove metal oxide
03/1993
03/30/1993US5198204 Contacting carbamate with nitrating agent and neutralization
03/24/1993CN1070128A Palladium/manganese oxide deoxidizing agent
03/23/1993CA1314821C Pressure swing adsorption process and system for gas separation
03/17/1993EP0532396A1 Process for the preparation of polydichlorophosphazen from a precursor composition on the basis of hexachlorocyclotriphosphazen
03/17/1993EP0532155A1 Cryogenic process for producing ultra high purity nitrogen
03/17/1993CA2076301A1 Eta phase materials, methods of producing the same, and use thereof as catalysts for alcohol synthesis, hydrocarbon synthesis, hydrocarbon hydrogenation and hydrocarbon conversionreactions
03/16/1993US5194642 Metallo-organic precursors to titanium nitride
03/16/1993US5194338 Silicon carbide and/or nitride, metal boride, zirconium, polysilazane binder
03/16/1993US5194236 Bulk niobium placed in powder including metal that can be nitride burned and nitrided
03/16/1993US5194234 Method for producing uniform, fine boron-containing ceramic powders
03/16/1993US5194071 Crystallization with heat and pressure
03/16/1993CA1314491C Integrated pressure swing adsorption/membrane separation
03/12/1993CA2077925A1 Process for the preparation of polydichlorophosphazenes using a hexachlorocyclotriphosphazine-based precursor composition
03/09/1993US5192355 Manufacturing and using nitrogen fertilizer solutions on a farm
03/03/1993EP0529052A1 Gas separations utilizing glassy polymer membranes at sub-ambient temperatures.
03/02/1993US5190738 Process for producing unagglomerated single crystals of aluminum nitride
02/1993
02/23/1993US5188813 Catalyst gauze
02/23/1993US5188757 Precursor compositions for conversion to boron nitride
02/23/1993US5188130 Chemical heat source comprising metal nitride, metal oxide and carbon
02/20/1993CA2049507A1 Pressurization psa systems for the production of high purity product gas
02/18/1993WO1993002787A1 Process for the production of ultra-fine powdered materials
02/17/1993CN1069072A Process for recovery of titanium values from complex matrix comprising titanium nitride
02/16/1993US5187129 Process for making silicon nitride and powders and articles made therefrom
02/16/1993CA1313630C Adsorptive separation utilizing multiple adsorption beds
02/09/1993US5185139 Removal of particulate matter and trace contaminatnts; separation; liquifying carbon dioxide; distillation
02/03/1993EP0525603A1 Process for the preparation of hydroxyl ammonium salts
02/03/1993EP0345354B1 Process for purifying nitrogen-fluoride
02/02/1993US5183647 Decomposing impurities dinitrogen difluoride in specified vessel it's wall surface is covered with passive film nickle fluide
01/1993
01/27/1993EP0524858A1 Method of making boron nitride ceramics from hydrazine derivate precursors
01/27/1993EP0524848A1 Process for the preparation of silicon nitride by carbonitridation of silica and silicon nitride particles free of whiskers
01/27/1993EP0524789A1 Process for preparing cubic boron nitride abrasive
01/27/1993EP0242394B1 Reduction of nitrogen-based pollutants through the use of urea solutions containing oxygenated hydrocarbon solvents
01/26/1993US5182239 Aluminum nitride granules and process for the preparation thereof
01/26/1993US5182092 Hydroxylammonium nitrate process
01/26/1993CA2070437A1 Cubic boron nitride abrasive and process for preparing same
01/21/1993DE4124119A1 High purity, finely dispersed aluminium nitride powder prodn. - by mixing aluminium salt soln. with sodium carboxymethyl:cellulose soln. calcining the easily filtered prod., nitriding and igniting
01/20/1993EP0523225A1 Process of removing nitrite from a silver nitrate solution.
01/20/1993CN1068095A Method of making sinterable ceramic powder
01/19/1993US5180512 Method of manufacturing fine-particle colloid or magnetic fluid
01/19/1993CA1312830C Process for separating nitrogen from mixtures thereof with less polar substances
01/19/1993CA1312829C Selective adsorption of co -on zeolites
01/18/1993CA2074030A1 Process for the preparation of boron nitrid ceramics from hydrazine-derived precursors
01/13/1993EP0522872A1 Substoichiometric zirconium nitride coating
01/13/1993EP0522634A1 Direct catalytic process for the production of hydroxylamine
01/13/1993EP0521849A1 Process, composition, and apparatus for purifying inert gases to remove lewis acid and oxidant impurities therefrom.
01/12/1993US5178847 Process for producing ceramic raw materials
01/12/1993US5178844 Method and apparatus for producing nitride products
01/12/1993CA1312449C Inert gas purifier for bulk nitrogen without the use of hydrogen or other reducing gases
01/12/1993CA1312446C Sublimation method
01/07/1993WO1993000626A1 System for controlled nitriding
01/07/1993WO1993000293A1 Method for the preparation of niobium nitride
01/07/1993WO1993000292A1 Process of making niobium oxide
01/07/1993EP0521784A1 Multistage cascade-sweep process for membrane gas separation
01/05/1993US5176895 Process for the continuous production of sodium azide
01/05/1993US5176893 Silicon nitride products and method for their production
01/05/1993US5176889 Method and apparatus for treatment of NF3 gas
01/05/1993US5176722 Nitrogen from air
01/05/1993CA1312412C Process for the production of linear polyphosphazenes
01/05/1993CA1312189C Multi-stage process for reducing the concentration of pollutants in an effluent
01/03/1993CA2072769A1 Process for the preparation of silicon nitride by silicon carbonitriding and silicon nitride in whisker-free particulate form
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