Patents
Patents for C01B 21 - Nitrogen; Compounds thereof (10,781)
09/1993
09/15/1993CN1076221A Method and apparatus for forming a heat treating atmosphere
09/15/1993CN1076172A Direct process for producing sodium nitrite
09/11/1993CA2091209A1 Method for forming a heat treating atmosphere
09/11/1993CA2090537A1 Reaction injection molding of silicon nitride ceramics having crystallized grain boundary phases
09/08/1993EP0558887A1 Inorganic microporous particles and process for their preparation
09/08/1993EP0558842A1 Process for preparing aluminium nitride powder
09/07/1993US5242882 Catalyst for the production of nitric acid by oxidation of ammonia
09/07/1993US5242753 Wear and erosion resistance; high microhardness
09/02/1993WO1993017156A1 Inert gas purifying system
08/1993
08/31/1993US5240658 Curing a nondilatant mixture including silicate-forming sintering aid, silicide and curable silicon nitride precursor; heating under vacuum; deoxygenation
08/31/1993US5240474 Air separation by pressure swing adsorption with a high capacity carbon molecular sieve
08/31/1993US5240472 Membrane system; dryer unit incorporates selective surface flow adsorbent membrane of gamma-alumina or silica gel
08/31/1993US5240471 Multistage cascade-sweep process for membrane gas separation
08/25/1993EP0557163A1 Continuous process for the preparation of silicon nitride by carbonitridation
08/25/1993CN1075470A Continuous process for preparing silicon nitride and the silicon nitride prepared
08/24/1993US5238670 Process for preparing ultra-pure nitrogen
08/24/1993CA1321547C Membrane separation system and process
08/19/1993WO1993016016A1 Moisture-resistant aluminum nitride powder and methods of making and using
08/19/1993WO1993016015A1 Process for preparing an amorphous, extra-hard material based on boron nitride
08/19/1993WO1993016014A1 Process for producing ceramic mouldings
08/19/1993WO1993016002A1 Process for forming a dinitramide salt or acid
08/19/1993DE4204009A1 Verfahren zur herstellung von amorphem ultrahartem bornitrid A process for preparing amorphous boron nitride ultrahard
08/19/1993CA2128608A1 Process for forming a dinitramide salt or acid
08/19/1993CA2089700A1 Continuous carbonitriding process for the preparation of silicon nitride; silicon nitride thus produced
08/18/1993EP0259366B1 Polysilazanes and related compositions, processes and uses
08/18/1993CN1075300A Method for continuous preparation of aluminium nitride by carbonitrogenation of aluminium oxide
08/18/1993CN1021808C Method and apparatus for producing silicon nitride powder by laser
08/17/1993US5236685 Preparation of hydroxylammonium salts
08/17/1993US5236684 Process for the preparation of spherical amorphous silicon nitride
08/14/1993CA2088553A1 Polymer precursor for silicon carbide/aluminum nitride ceramics
08/12/1993DE4203269A1 Verfahren zur herstellung von keramikformkoerpern A process for preparing keramikformkoerpern
08/11/1993EP0555184A1 Filler for heat conducting polymers
08/11/1993EP0555110A1 Process for thermochemical oxidation of nitrous oxide
08/11/1993EP0554999A1 Alkali metal azide particles
08/11/1993EP0554805A1 Air separation by pressure swing adsorption with a high capacity carbon molecular sieve
08/10/1993US5234712 Coating with layer of organic silicate; heat treating
08/10/1993US5234676 Buffered aqueous solution with reduced tendency for hydrolysis
08/10/1993US5233837 Liquefaction by using expanded nitrogen-rich gaseous stream to heat exchanging
08/10/1993CA1321154C Method for densely packing molecular sieve adsorbent beds in a psa system
08/08/1993CA2088954A1 Filler for heat-conductive plastics materials
08/07/1993CA2088323A1 Alkali metal azide particles
08/05/1993WO1993015087A1 Metallo-organic precursors
08/05/1993WO1993015032A1 Process of spray drying sialon___________________________________
08/05/1993WO1993015019A1 Method for obtaining nitrides
08/04/1993EP0554020A1 Silicon nitride powder and method for its manufacture
08/04/1993EP0553072A1 Synthetic porous crystalline material, its synthesis and use.
08/03/1993US5233066 Silicon boron nitride ceramic and precursor compounds, a process for their preparation and their use
08/03/1993US5232891 Process for the manufacture of a gauze for a catalytic converter and a gauze for a catalytic converter manufactured according thereto
08/03/1993US5232677 Preparation of silicon nitride powder by partially nitriding in a fluidized bed and then completing nitridation in a moving bed
08/03/1993CA1320940C Clean nanocrystalline powders and articles made therefrom
07/1993
07/31/1993CA2088034A1 Air separation by pressure swing adsorption with a high capacity carbon molecular sieve
07/28/1993EP0542871A4 Process for improving the physical and catalytic properties of fluid cracking catalysts
07/27/1993US5230875 Poly(dichlorophosphazenes)/poly(organophosphazenes) having regulated molecular weights
07/27/1993US5230873 Process for producing amorphous boron nitride of high hardness
07/25/1993CA2087549A1 Metallo-organic precursors to titanium nitride
07/22/1993WO1993014027A2 Process for preparing ultrafine aluminum nitride powder
07/22/1993CA2126343A1 Process for preparing ultrafine aluminum nitride powder
07/21/1993EP0238654B1 Reduction of nitrogen- and carbon-based pollutants through the use of urea solutions
07/20/1993US5229468 Polymer precursor for silicon carbide/aluminum nitride ceramics
07/20/1993US5228888 Economical air separator
07/13/1993US5227195 Forming coating of metal carbide, metal oxide and/or metal nitride; intermediate is reacted with reactant containing carbon, oxygen or nitrogen
07/13/1993US5227149 Reacting liquid or supercritical fluid hydrogen sulfide with alkyl silicon compound, silicon tetrachloride, or trialkyl aluminum in autoclave, high pressure
07/13/1993US5227146 Mercaptothiazoles
07/13/1993US5226952 Nitride process for refining calcium
07/13/1993US5226931 Process for supplying nitrogen from an on-site plant
07/13/1993CA1320305C Polysilazanes, processes for their preparation, ceramic materials which contain silicon nitride and can be prepared from them, and preparation thereof
07/06/1993US5225280 Metal containing derivatives of aminotriazine polymer and method of preparing same
07/06/1993US5225174 Solvent, organometallic complex
07/06/1993US5224986 Procss for the recovery of titanium values
06/1993
06/30/1993EP0548755A1 Nitrogen adsorption with a Ca and/or Sr exchanged lithium X-zeolite
06/30/1993EP0548499A1 Process for the oxidative purification of nitrogen oxides containing exhaust gases
06/30/1993CN1073658A Novel process for the preparation of boron nitride and the thus-obtained boron nitride
06/30/1993CN1021453C Process for preparation of polysilazanes
06/29/1993CA1319712C Carbothermally reduced ceramic materials and method of making same
06/23/1993EP0547387A1 Membrane air drying and separation operations
06/23/1993EP0547071A1 Improvements in or relating to self-gettering catalysts
06/23/1993EP0304478B1 Process for nitrogen oxides reduction with minimization of the production of other pollutants
06/22/1993US5221527 Drying aluminum hydroxide, grinding with carbon in nonaqueous fluid, separating, drying, calcining and heat treating in nitrogen, oxidizing excess carbon
06/16/1993EP0546808A1 Nitrogen sorption
06/16/1993EP0546670A1 Metal nitride films
06/16/1993EP0546014A1 Nitrogen atmospheres
06/15/1993US5219804 Process for preparing ultrafine aluminum nitride powder
06/15/1993US5219539 Process for preparing fine aluminum nitride powder from an inorganic flocculant
06/15/1993US5219537 Powder comprising silicon nitride and elemental silicon
06/15/1993CA1319151C2 ¬¬(3-pyridinyl)methylene|amino|alcohols
06/09/1993EP0545169A2 Silicon containing ceramic powders having a low fluorine content and process for the preparation thereof
06/09/1993EP0544710A1 Improvements in or relating to catalysts and getter systems
06/08/1993US5217939 Catalyst for the prduction of nitric acid by oxidation of ammonia
06/04/1993CA2084268A1 Metal nitride films
06/02/1993EP0544570A1 Process for the preparation of boron nitride and the obtaind boron nitride
06/02/1993CN1021021C Preparation of nitric acid rare earth nickelate catalyst with oxidized nitrogen
05/1993
05/29/1993CA2083881A1 Process for the preparation of boron nitride and the thus-obtained boron nitride
05/27/1993WO1993011395A1 Combined adjustable-flow rate nitrogen and oxygen production method
05/27/1993CA2101258A1 Combined adjustable-flow rate nitrogen and oxygen production method
05/26/1993EP0543009A1 Process for purifying nitrogen trifluoride gas
05/26/1993EP0543008A1 Ceramic fibers and process for their production
05/26/1993EP0542871A1 Process for improving the physical and catalytic properties of fluid cracking catalysts
05/26/1993CN1020884C Improved process and system for production of dry high purity nitrogen
05/25/1993US5213784 Process for the production of high purity hydroxylammonium nitrate
05/25/1993US5213729 Process for preparing a densified beta-phase silicon nitride material having at least one densification aid, and the material resulting therefrom
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