Patents by Inventor Arnold Lenz
Arnold Lenz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4268485Abstract: A process for separating radioactive impurities from baddeleyite to obtain zirconium dioxide containing only traces of radioactive impurities, comprising grinding the baddeleyite preferably to a particle size of a maximum of 2% greater than 0.06 mm and then treating it directly with a 10 to 60% by weight aqueous alkali hydroxide solution at elevated temperatures below the boiling point of said solution at temperatures of 80.degree. to 140.degree. C. for 2 to 15 hours or until the desired degree of purity of the zirconium dioxide is obtained. In a preferred embodiment, sodium hydroxide is utilized and the ground baddeleyite preliminarily has been purified to the content of greater than 98% (zirconium dioxide+hafnium dioxide) by known methods.Type: GrantFiled: December 3, 1976Date of Patent: May 19, 1981Assignee: Dynamit Nobel AktiengesellschaftInventors: Klaus Deneke, Arnold Lenz
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Patent number: 4243422Abstract: Method of preparing granular quartz glass which comprises heating a porous granulated silica gel having an alkoxy group content equal to or less than 1 weight percent and a total impurity content of less than 1 part per million, the porous granulated silica gel obtained by hydrolysis of an orthosilicic acid ester of an aliphatic alcohol at a temperature up to 1400.degree. C.Type: GrantFiled: December 14, 1977Date of Patent: January 6, 1981Assignee: Dynamit Nobel AktiengesellschaftInventors: Arnold Lenz, Gerhard Kreuzburg, Rainer Haase
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Patent number: 4197252Abstract: A process for preparing an orthosilicic acid tetraester of a monoalkyl ether of an aliphatic glycol having 2 to 6 carbon atoms which comprises contacting silicon, iron silicide or ferrosilicon with a monoalkyl ether of an aliphatic glycol having 2 to 6 carbon atoms in the aliphatic chain in the presence of the corresponding orthosilicic acid tetraalkoxy alkyl ether at a temperature between 125 and 250.degree. C.Type: GrantFiled: October 30, 1974Date of Patent: April 8, 1980Assignee: Dynamit Nobel AktiengesellschaftInventors: Wilhelm Joch, Arnold Lenz, Walter Rogler
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Patent number: 4185029Abstract: A process for preparing an orthosilicic acid tetraalkyl ester having 2 to 6 carbon atoms in the ester group which comprises contacting metallic silicon with an alcohol corresponding to the ester group in the presence of the corresponding alkali alcoholate:A. in the presence of a surface active substance;B. in the presence of a compound containing a methoxy group; orC. under pressure at a temperature above the boiling point of the reaction mixture.Type: GrantFiled: January 5, 1978Date of Patent: January 22, 1980Assignee: Dynamit Nobel AktiengesellschaftInventors: Gerhard Kreuzburg, Arnold Lenz, Walter Rogler
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Patent number: 4120938Abstract: A process for the preparation of an aqueous alkali metal polysilicate solution having an SiO.sub.2 : alkali metal oxide mole ratio of 2.5 - 5.5 : 1 and a silica content of 16 - 23% by weight which comprises contacting a tetraalkoxysilane of the formula Si(OR).sub.4 wherein each R is independently a straight or branched-chain alkyl group of 1 to 3 carbon atoms with an aqueous alkali metal hydroxide solution at a temperature between room temperature and the boiling point of the reaction mixture and at a temperature up to 100.degree. C. distilling over alcohol formed by the reaction of the silane with the alkali metal hydroxide.Type: GrantFiled: July 8, 1976Date of Patent: October 17, 1978Assignee: Dynamit Nobel AktiengesellschaftInventors: Rainer Haase, Volker Hunger, Arnold Lenz
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Patent number: 4113761Abstract: A process for preparing an orthosilicic acid tetraalkyl ester having 2 to 6 carbon atoms in the ester group which comprises contacting metallic silicon with an alcohol corresponding to the ester group in the presence of the corresponding alkali alcoholate:A. in the presence of a surface active substance;B. in the presence of a compound containing a methoxy group; orC. under pressure at a temperature above the boiling point of the reaction mixture.Type: GrantFiled: July 19, 1976Date of Patent: September 12, 1978Assignee: Dynamit Nobel AktiengesellschaftInventors: Gerhard Kreuzburg, Arnold Lenz, Walter Rogler
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Patent number: 4098595Abstract: Method of preparing granular quartz glass which comprises heating a porous granulated silica gel having an alkoxy group content equal to or less than 1 weight percent and a total impurity content of less than 1 part per million, the porous granulated silica gel obtained by hydrolysis of an orthosilicic acid ester of an aliphatic alcohol at a temperature up to 1400.degree. C.Type: GrantFiled: December 20, 1976Date of Patent: July 4, 1978Assignee: Dynamit Nobel AktiengesellschaftInventors: Arnold Lenz, Gerhard Kreuzburg, Rainer Haase
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Patent number: 4079058Abstract: Process of producing a naphthyridine or quinoline compound of the formula: ##STR1## wherein R.sub.2, R.sub.3, R.sub.4, and R.sub.6 can be alkyl, and R.sub.1 is nitrogen or CH. The corresponding pyridyl- or phenylaminomethylenemalonic acid diester is cyclized to yield said compound and an alcohol. The malonic acid diester at below reaction temperature is added to a solvent, e.g., diphenyl benzene, at above reaction temperature in proportion so that the mixture attains reaction temperature. Good yields at high throughputs are achieved.Type: GrantFiled: October 1, 1976Date of Patent: March 14, 1978Assignee: Dynamit Nobel AGInventors: Otto Ackermann, Karl-Theo VON Meszoly, Arnold Lenz
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Patent number: 4042636Abstract: A process for the preparation of an alcohol-free alkali or alkaline earth metal alcoholates dissolved in inert solvent which comprises contacting at least an equimolar amount of an alkali or alkaline earth metal dissolved in an inert solvent with an alcohol at an elevated pressure and at a temperature of at least that at which crystal alcohol splits off from the corresponding alkali or alkaline earth metal alcoholate and below the temperature at which said alcoholate decomposes under the prevailing pressures.Type: GrantFiled: November 12, 1975Date of Patent: August 16, 1977Assignee: Dynamit Nobel AktiengesellschaftInventors: Arnold Lenz, Walter Rogler
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Patent number: 4024173Abstract: The hydrogenation of benzene dicarboxylic acid mono and diesters to corresponding cyclohexene dicarboxylic acid mono and diesters by carrying out the hydrogenation in the active and effective presence of alkalimetal amalgam and an alcohol in a substantially anhydrous environment. The hydrogenation reaction medium should be a mixture of the above referred to alcohol and an aromatic hydrocarbon such as toluene.Type: GrantFiled: December 10, 1974Date of Patent: May 17, 1977Assignee: Dynamit Nobel AktiengesellschaftInventors: Arnold Lenz, Otto Bleh, Harald VON Metnitz
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Patent number: 4006175Abstract: Porous silicic acid having a specific surface of about 50 to 1000 m.sup.2 /g and having an anion content below the chemically determinable limit of detection is made by hydrolyzing methyl or ethyl silicate or polymethyl or polyethyl silicate with about 70 to 120% of the stoichiometric amount of water with moderate stirring.Hydrolysis activators such as acids or bases may be present as well as alcoholates of oxides of transition metals which then appear in the end product. Alcohol may also be present to facilitate hydrolysis.The products are characterized by marked purity and their specific surface can be closely and reproducibly controlled.Type: GrantFiled: July 24, 1974Date of Patent: February 1, 1977Assignee: Dynamit Nobel AktiengesellschaftInventors: Erich Termin, Arnold Lenz, Otto Bleh
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Patent number: 3987074Abstract: A process for the preparation of a vanadyl alcoholate which comprises contacting vanadium pentoxide with an alcohol in the presence of an orthoester of the formula R' . C(OR").sub. 3 wherein:R' is hydrogen, a straight-chained alkyl group of 1 to 5 carbon atoms or a branched chain alkyl group of 1 to 5 carbon atoms; andR" is a straight-chained alkyl group of 1 to 12 carbon atoms, a branched-chain alkyl group of 1 to 12 carbon atoms or phenyl.Type: GrantFiled: August 21, 1974Date of Patent: October 19, 1976Assignee: Dynamit Nobel AktiengesellschaftInventors: Ranier Haase, Arnold Lenz
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Patent number: 3984526Abstract: A process for the preparation of an aqueous alkali metal polysilicate solution having an SiO.sub.2 : alkali metal oxide mole ratio of 2.5 - 5.5 : 1 and a silica content of 16 - 23% by weight which comprises contacting a tetraalkoxysilane of the formula Si(OR).sub.4 wherein each R is independently a straight or branched-chain alkyl group of 1 to 3 carbon atoms with an aqueous alkali metal hydroxide solution at a temperature between room temperature and the boiling point of the reaction mixture and at a temperature up to 100.degree.C. distilling over alcohol formed by the reaction of the silane with the alkali metal hydroxide.Type: GrantFiled: August 12, 1974Date of Patent: October 5, 1976Assignee: Dynamit Nobel AktiengesellschaftInventors: Rainer Haase, Volker Hunger, Arnold Lenz
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Patent number: 3971833Abstract: A process for the preparation of an alcohol-free alkali or alkaline earth metal alcoholates dissolved in inert solvent which comprises contacting at least an equimolar amount of an alkali or alkaline earth metal dissolved in an inert solvent with an alcohol at an elevated pressure and at a temperature of at least that at which crystal alcohol splits off from the corresponding alkali or alkaline earth metal alcoholate and below the temperature at which said alcoholate decomposes under the prevailing pressures.Type: GrantFiled: June 25, 1974Date of Patent: July 27, 1976Assignee: Dynamit Nobel AktiengesellschaftInventors: Arnold Lenz, Walter Rogler
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Patent number: 3963831Abstract: Alkali metal hydrides, obtained by reacting alkali metals in liquid form with hydrogen in the presence of alkali metal hydrides, are obtained in coarsely crystalline form by continuously introducing into the reaction vessel containing constantly agitated alkali metal hydride only so much alkali metal in liquid form which corresponds stoichiometrically to the amount of hydrogen reacted and maintaining the unreacted metal concentration at 3 weight percent or less of the pre-introduced metal hydride present. In preferred aspect, the pre-introduced metal hydride is agitated by mixing means at a circumferential velocity of 0.5 to 2 meters/second and maintained at 250.degree.-310.degree.C., to yield hydride crystals in the range of 100 to 1000 microns. The hydride thus obtained may be ground in an inert hydrocarbon mixture to a finer particle material still having a relatively low surface area and recovered as a stabilized, non-sticking, non-self ignitable alkali metal hydride product.Type: GrantFiled: December 5, 1973Date of Patent: June 15, 1976Assignee: Dynamit Nobel AktiengesellschaftInventors: Arnold Lenz, Walter Rogler