| Patents for C01B 21 - Nitrogen; Compounds thereof (10,781) |
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| 12/24/1991 | US5075091 Process for the preparation of silicon nitride |
| 12/24/1991 | US5075055 Process for producing a boron nitride crucible |
| 12/24/1991 | US5074892 Using lithium exchanged type x zeolite |
| 12/24/1991 | CA1293359C Process for removing oxides of nitrogen and sulfur from waste gases |
| 12/20/1991 | CA2044909A1 Pressure swing adsorption method for separating gaseous mixtures |
| 12/19/1991 | WO1991019670A1 Method of forming dinitramide salts |
| 12/19/1991 | WO1991019669A1 Dinitramide salts and method of making same |
| 12/19/1991 | CA2064472A1 Method of forming dinitramide salts |
| 12/18/1991 | EP0461478A1 Improved air separation pressure swing adsorption process |
| 12/17/1991 | US5073358 Continuous withdrawing nitride product form first fluidized be d and supplying to second fluidized bed for nitriding |
| 12/17/1991 | US5073193 Method of collecting plasma synthesize ceramic powders |
| 12/17/1991 | CA1293106C Method of producing silicon nitride powders |
| 12/11/1991 | EP0460943A1 Boron nitride crucible and its production |
| 12/11/1991 | EP0460636A2 Improved membrane nitrogen process and system |
| 12/10/1991 | US5071935 Ammoniolysis of a cyclic triborotriazine, a dichloroazoboron compound and primary amine; heat-resistant crosslinked network; fiber; filaments; efficiency |
| 12/10/1991 | US5071813 Carbides, nitrides, or carbonitrides of molybdenum, tungsten, iron, cobalt, nickel |
| 12/10/1991 | US5071450 Pyrolysis of a carbon-containing organic compound to deposit carbon to narrow pare size; selective adsorption |
| 12/07/1991 | CA2043910A1 Membrane nitrogen process and system |
| 12/04/1991 | EP0266417B1 Reduction of no x? in flue gas |
| 12/03/1991 | US5069887 Selective adsorption on zeolite having specified water of crys tallinity |
| 12/03/1991 | US5069728 Process for heat treating metals in a continuous oven under controlled atmosphere |
| 12/03/1991 | US5069690 Nitrogen trifluoride from carbon tetrafluoride; hydrothermally treated zeolite |
| 11/26/1991 | US5068037 Solvent extraction with 1-phenyl-3-methyl-4-trifluoroacetylpyrazol-5-one and trioctylphosphine oxide |
| 11/21/1991 | EP0457059A1 Process for removal of nitrogen oxides producing HNO3 |
| 11/20/1991 | CN1056293A Machine for making pure nitrogen by pressure variation and adsorption |
| 11/19/1991 | US5066530 Ultraviolet Sunscreen |
| 11/19/1991 | US5066473 Surface treatment, oxidation |
| 11/13/1991 | EP0220198B1 Preparing metal compounds by pyrolysis |
| 11/13/1991 | CA2042464A1 Process for the removing of nitrogen from exhaust gases while obtaining hno3 |
| 11/12/1991 | US5064538 Dialysis and electrodialysis |
| 11/07/1991 | DE4013205A1 Cooling nitrogen oxide(s)-contg. gas mixt. |
| 11/06/1991 | CN1014598B Method for preparing polychlorophosphnitrile |
| 11/06/1991 | CN1014587B Selective adsorption of c02 on zeolites |
| 10/31/1991 | WO1991016266A1 PROCESS AND DEVICE FOR COOLING DOWN A NOx-CONTAINING GASEOUS MIXTURE FROM A NITRIC ACID PRODUCTION PLANT |
| 10/30/1991 | EP0454622A1 Alkenyl substituted stabilizers |
| 10/30/1991 | EP0454531A1 Process and apparatus for the preparation of ultra-pure nitrogen |
| 10/30/1991 | CN1055728A Polymeric hydridosilazane and process for production thereof and from which manufacture of ceramic materials containing silicon nitride and process for production thereof |
| 10/30/1991 | CN1055716A Ceramic materals containing silicon nitride and process for production theereof |
| 10/30/1991 | CN1055715A Polymeric hydridothiosilazane and process for production thereof and from which manufacture of ceramic materials containing silicon nitride and process for production thereof |
| 10/29/1991 | US5061469 Process for producing shaped boron nitride product |
| 10/29/1991 | US5061416 Infiltrating with liquid, freezing, thawing |
| 10/29/1991 | US5061298 Gas separating membranes formed from blends of polyimide polymers |
| 10/22/1991 | US5059578 Thermosetting phenolic resin of specific infrared absorption, polyvinyl alcohol or cellulose binder, molding heat treating |
| 10/21/1991 | CA2040745A1 Process and device for the production of ultra-pure nitrogen |
| 10/17/1991 | WO1991015868A1 Process, composition, and apparatus for purifying inert gases to remove lewis acid and oxidant impurities therefrom |
| 10/16/1991 | EP0451677A2 Vacuum swing adsorption process for production of 95+% N2 from ambient air |
| 10/11/1991 | CA2039649A1 Vacuum swing adsorption process for production of 95+% n2 from ambient air |
| 10/09/1991 | EP0450785A1 Air separator |
| 10/09/1991 | EP0450562A2 Nitride products and method and apparatus for producing nitride products |
| 10/01/1991 | US5053365 Method for the low temperature preparation of amorphous boron nitride using alkali metal and haloborazines |
| 10/01/1991 | CA1289976C Method of production of ceramic powders and powders thus obtained |
| 09/24/1991 | US5051143 Alkali metal azide, alkali metal perchlorate oxidizer |
| 09/24/1991 | US5051115 Pressure swing adsorption process |
| 09/24/1991 | CA2037985A1 Economical air separator |
| 09/22/1991 | WO1991014655A1 Process for the treatment of an aqueous solution containing mainly nitric and hydrofluoric acids |
| 09/19/1991 | WO1991013679A1 Bulk gas sorption composition and apparatus |
| 09/18/1991 | EP0447388A1 Procedure for manufacturing of finegrain, sinteractive nitride- and carbonitride-powders of titanium |
| 09/18/1991 | CN1013962B Process for recovery of platinum catalyst |
| 09/17/1991 | US5049529 Conversion of polycarbosilanes into silicon carbonitride ceramics |
| 09/17/1991 | US5049367 Aluminum nitride powder and process for preparation of the same |
| 09/12/1991 | DE4107191A1 Iridium catalyst for hydrazinolysis - prepd. on aluminium oxide carrier of large surface area |
| 09/11/1991 | CN1054402A Low temp. purification of gases |
| 09/11/1991 | CN1013881B Production of controllable atmosphere of nitrogen contg. co |
| 09/05/1991 | WO1991013044A1 Chromium-based nitrified baked material and method of obtaining it |
| 09/04/1991 | CN1054232A End purifying device suitable for n (a, he) and refining route |
| 08/29/1991 | DE4027404A1 Nitric oxide oxidn. in gas stream by scrubbing with nitric acid - contg. nitrous acid by desorbing of acid cpds. into gas and replacing nitrous acid |
| 08/28/1991 | CN1013662B Method for preparation polychlorophosphnitrile under bis (dichlor-phosphoryl) imide |
| 08/28/1991 | CN1013661B Process for n-(dichloro-phosphate-acyl)-trichloro-phosphate-nitrile |
| 08/28/1991 | CN1013660B Process for producing n-(dichloro-phosphoryl) trichlorophosphazene from phosphorus pentachloride and ammonium chloride |
| 08/28/1991 | CN1013659B Method and facility for producing silicon nitride powder |
| 08/28/1991 | CN1013658B Method for purification nitrogen for refining aluminium fusant |
| 08/27/1991 | US5043219 Composite material |
| 08/21/1991 | EP0442032A1 Process for preparing silicon nitride |
| 08/21/1991 | EP0442013A1 Isocyanate- and isothiocyanate-modified polysilazane ceramic precursors |
| 08/21/1991 | CN2083147U Novel ammonia seperator |
| 08/20/1991 | US5041276 Ammonia oxidation |
| 08/15/1991 | CA2024139A1 Silicon nitride vacuum furnace process |
| 08/14/1991 | EP0440604A1 Devices and method for cleaning gases. |
| 08/13/1991 | US5039502 Dissolving metals in nitric acid containing nitrous acid-forming additive; inhibition of ammonium nitrate formation |
| 08/07/1991 | EP0440235A2 Preparation of silicon nitride powder |
| 08/07/1991 | EP0439845A2 Alpha-omega chlorosilazanes and a method for their preparation |
| 08/06/1991 | US5037624 Composition, apparatus, and process, for sorption of gaseous compounds of group II-VII elements |
| 08/06/1991 | CA1287433C Preceramic polymers derived from cyclic silazanes, and halosilanes anda method for their preparation |
| 08/06/1991 | CA1287432C Preceramic polymers derived from cyclic silazanes and halogenated disilanes and a method for their preparation |
| 07/30/1991 | US5035775 Ultrapure hydrazine production |
| 07/28/1991 | CA2034953A1 .alpha.,w-chlorosilazanes, and a process for their preparation |
| 07/25/1991 | WO1991010629A1 Process for using dross residues to produce refractory products |
| 07/25/1991 | DE4100532A1 Impure nitric acid treatment - by addn. to phosphoric acid and recovery by distn. or in reduced form |
| 07/24/1991 | EP0438282A1 Production of pure nitrogen from air |
| 07/24/1991 | EP0438036A2 Method for determining the end of useful life of an inert gas purifier and apparatus therefor |
| 07/24/1991 | EP0437824A1 Process for the preparation of nitrosylsulfuric acid |
| 07/20/1991 | CA2034597A1 Low temperature purification of gases |
| 07/16/1991 | US5032370 Method of preparing silicon nitride with a high alpha-phase content |
| 07/16/1991 | US5032152 Modified molecular sieve |
| 07/10/1991 | CN1052874A Boron-nitrogen polymer, method of production and uses as boron nitride precursor |
| 07/09/1991 | US5030434 Silicon nitride powders with improved surface properties and processes for their preparation |
| 07/02/1991 | US5028571 Conversion of polycarbosilanes into silicon nitride ceramics |
| 06/27/1991 | WO1991008983A1 Process for producing aqueous ammonium nitrite solutions and use of these solutions as volatile corrosion inhibitors |
| 06/27/1991 | WO1991008982A1 Catalyst pack support in ammonia oxidation burner |
| 06/27/1991 | DE3942065A1 Verfahren zur herstellung waessriger ammoniumnitritloesungen und verwendung dieser loesungen als fluechtiger korrosionsinhibitor Process for preparing aqueous ammonium nitrite loesungen and use this loesungen as volatile corrosion inhibitor |