Patents by Inventor Hartmut Pietsch
Hartmut Pietsch 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: 4775107Abstract: A mechanical disintegration is effected in which substantially only the metal sheath of the small batteries is torn apart. The crushed material is roasted at 500.degree. to 1000.degree. C. in a state of motion in an oxidizing atmosphere and the volatilized mercury is recovered from the exhaust gas. The roasted material is separated by sieving and magnetic separation into an iron-containing scrap fraction, a brass-containing scrap fraction and a collectable fraction, which contains manganese, zinc and silver.Type: GrantFiled: April 21, 1987Date of Patent: October 4, 1988Assignee: Metallgesellschaft AGInventors: Rudolf Heng, Walter Koch, Hartmut Pietsch
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Patent number: 4472359Abstract: A process of leaching ores, ore concentrates, intermediate metallurgical products and the like, which contain acid-soluble constituents, by a treatment in an acid aqueous solution under pressure in a tubular reactor. The slurry contains suitably 300 to 1100 g starting material per liter of water and a velocity of flow of 0.5 to 4.0 m/sec. is suitably maintained throughout the flow path in the tubular reactor of the slurry and of the leached suspension.Type: GrantFiled: February 23, 1982Date of Patent: September 18, 1984Assignees: Metallgesellschaft AG, Vereinigte Aluminium-Werke AGInventors: Hartmut Pietsch, Wolfgang Turke, Hubert Bings, Karl-Josef Memmel
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Patent number: 4438076Abstract: Gold and/or silver is leached from comminuted ore with an alkaline cyanide lixiviant at a superatmospheric pressure of at least 25 bar and with high purity oxygen (at least 90% pure) to reduce the residence time at high yield.Type: GrantFiled: August 12, 1983Date of Patent: March 20, 1984Assignees: Metallgesellschaft AG, Vereinigte Aluminum-Werke AGInventors: Hartmut Pietsch, Wolfgang Turke, Ernst Bareuther, Fritz Kampf, Hubert Bings
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Patent number: 4436704Abstract: A method of recovering uranium dioxide from a sodium uranyl carbonate solution obtained by the alkaline carbonate leaching of uranium ore in which a solution is reacted at a temperature above 130.degree. C. and at superatmospheric pressure with particular metallic iron. The precipitated UO.sub.2 is recovered from the solution.Type: GrantFiled: June 24, 1982Date of Patent: March 13, 1984Assignee: Metallgesellschaft AktiengesellschaftInventors: Otmar Krennrich, Gottfried Brendel, Hartmut Pietsch
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Patent number: 4361541Abstract: A method for continuously extracting uranium from ores comprises the steps of forming a slurry of ore in a leaching solution; heating the slurry while pumping it through a tube reactor at high turbulences characterized by Reynolds numbers in excess of 50,000; supplying gaseous oxygen at high pressures of at least 30 bar into the tube reactor such that the uranium is substantially completely oxidized in a soluble form but impurities in the slurry are substantially kept from becoming soluble; recovering the uranium oxide solute which is substantially free of impurities.Type: GrantFiled: September 4, 1979Date of Patent: November 30, 1982Assignees: Vereinigte Aluminium-Werke Aktiengesellschaft, Metallgesellschaft AktiengesellschaftInventors: Hubert Bings, Fritz Kampf, Roland Thome, Gerhard Wargalla, Gunter Winkhaus, Hartmut Pietsch, Wolfgang Turke, Peter Fischer
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Patent number: 4322271Abstract: N-Vinyl-N-alkyl-carboxylic acid amides are prepared, starting from N-ethyl-carboxylic acid amides, in a 3-stage process consisting of the following stages:(a) anodic alkoxylation of the N-ethyl-carboxylic acid amides to give N-.alpha.-alkoxyethyl-carboxylic acid amides;(b) alkylation of these N-.alpha.-alkoxyethyl-carboxylic acid amides with an alkyl halide or dialkyl sulfate in an alkaline medium to give N-.alpha.-alkoxyethyl-N-alkyl-carboxylic acid amides; and(c) splitting off of alcohol from the products of stage (b) by heating to temperatures between about 60.degree. and about 350.degree. C.Instead of stages (b) and (c), it is also possible to carry out the following stages after stage (a):(b.sub.1) splitting off of alcohol from the N-.alpha.-alkoxyethylcarboxylic acid amides obtained in stage (a) by heating to temperatures of about 60.degree. to about 600.degree. C., to give N-vinyl-carboxylic acid amides; and(c.sub.Type: GrantFiled: May 14, 1980Date of Patent: March 30, 1982Assignee: Hoechst AktiengesellschaftInventors: Harald Jensen, Erwin Schmidt, Michael Mitzlaff, Jurgen Cramer, Rudolf Pistorius, Hartmut Pietsch, Klaus Dehmer
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Patent number: 4052453Abstract: Process for preparing acetoacetamide-N-sulfofluoride by reacting amidosulfofluoride at a temperature of from 50.degree. to 100.degree. C with diketene, optionally in the presence of inert solvents or diluents.Type: GrantFiled: October 1, 1975Date of Patent: October 4, 1977Assignee: Hoechst AktiengesellschaftInventors: Hartmut Pietsch, Karl Clauss, Harald Jensen, Erwin Schmidt
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Patent number: 4009161Abstract: 3-Sulfohalides of 6-methyl-2H-1,3-oxazin-2,4(3H)-dione of the formula I ##STR1## in which X represents fluorine or chlorine are prepared by reacting fluorosulfonyl isocyanate or chlorosulfonyl isocyanate, at a temperature of from -35.degree. to +70.degree. C, optionally in the presence of an inert solvent, with diketene, acetoacetyl fluoride, acetoacetyl chloride, acetoacetic acid or an isopropenyl ester of the formula CH.sub.2 =C(OOCR)-CH.sub.3 in which R represents an alkyl radical having from 1 to 4 carbon atoms, a substituted or unsubstituted phenyl or benzyl radical.Type: GrantFiled: July 16, 1975Date of Patent: February 22, 1977Assignee: Hoechst AktiengesellschaftInventors: Hartmut Pietsch, Karl Clauss, Erwin Schmidt, Harald Jensen
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Patent number: 3993689Abstract: Compounds of the formula ##SPC1##In which R represents an alkyl radical having from 1 to 4 carbon atoms and Hal stands for fluorine or chlorine are prepared by reacting at a temperature of from -40.degree. to +20.degree. C an i-propenylalkanoic acid ester of the formula ##EQU1## with an isocyanate of the formulaO=C=N--SO.sub.2 Hal (V)in which R and Hal have the same meaning as above, and isolating the compound of formula III.Type: GrantFiled: July 16, 1975Date of Patent: November 23, 1976Assignee: Hoechst AktiengesellschaftInventors: Erwin Schmidt, Karl Clauss, Hartmut Pietsch, Harald Jensen
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Patent number: 3969348Abstract: 6-Methyl-3,4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide or the nontoxic salts thereof is prepared by reacting 6-methyl-2,3-dihydro-1,3-oxazin-2,4-dione-3-sulfo-fluoride of the formula ##EQU1## with at least 1 mole water per mole of fluoride to obtain acetoacetamide-N-sulfo-fluoride with splitting off of CO.sub.2, treating the acetoacetamide-N-sulfofluoride with an aqueous and/or alcoholic base and isolating the oxathiazinone or the salts thereof.Type: GrantFiled: July 16, 1975Date of Patent: July 13, 1976Assignee: Hoechst AktiengesellschaftInventors: Hartmut Pietsch, Karl Clauss, Erwin Schmidt, Harald Jensen
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Patent number: 3969347Abstract: The potassium salt practically free of fluoride of 6-methyl-3,4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide is prepared by cyclization of acetoacetamide-N-sulfofluoride with at least two moles potassium hydroxide, potassium methylate or a mixture of potassium hydroxide and potassium methylate per mole of sulfofluoride in methanol as solvent containing less than 50 % by weight of water at a temperature of from -20.degree. to +60.degree.C and separating the crystalline potassium salt of the oxathiazinone dioxide from the reaction solution. The compound obtained has a pure sweet taste.Type: GrantFiled: July 16, 1975Date of Patent: July 13, 1976Assignee: Hoechst AktiengesellschaftInventors: Erwin Schmidt, Karl Clauss, Hartmut Pietsch, Harald Jensen
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Patent number: 3968107Abstract: 6-Methyl-3,4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide and the nontoxic salts thereof are prepared by reacting acetoacetic acid with fluorosulfonyl isocyanate at a temperature of from -20.degree.C to +50.degree.C in the presence of from 0.5 to 2 moles, calculated on the FSI used, of an alkali methal fluoride or a tertiary amine of the formulaN(R.sub.1)(R.sub.2)(R.sub.3)in which R.sub.1, R.sub.2, R.sub.3 represent identical or different alkyl radicals having from 1 to 10 carbon atoms, two of the radicals R.sub.1 to R.sub.3 optionally form together an alkylene radical having from 4 to 5 carbon atoms which may contain N, O, or S as hetero atom, or one of the radicals R.sub.1 to R.sub.3 represents a phenyl radical, or of pyridine or quinoline, or of a mixture of the aforesaid compounds, and transforming the salt of acetoacetamide-N-sulfofluoride obtained into the oxathiazinone salt or the free oxathiazinone by a treatment with aqueous and/or alcoholic bases.Type: GrantFiled: July 16, 1975Date of Patent: July 6, 1976Assignee: Hoechst AktiengesellschaftInventors: Karl Clauss, Erwin Schmidt, Hartmut Pietsch, Harald Jensen
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Patent number: 3968106Abstract: 6-Methyl-3,4-dihydro-1,2,3-oxathiazin-4-one-2,2-dioxide and the nontoxic salts thereof are prepared by reacting acetone and fluorosulfonyl isocyanate in a molar proportion of from 14:1 to 150:1 at a temperature of from 0.degree. to 60.degree.C, distilling off the excess acetone from the reaction mixture with acetoacetamide-N-sulfofluoride and bringing about cyclization by a treatment with bases at a pH of from 5 to 12. The oxathiazinone derivatives are used as sweeteners.Type: GrantFiled: July 16, 1975Date of Patent: July 6, 1976Assignee: Hoechst AktiengesellschaftInventors: Karl Clauss, Hartmut Pietsch, Erwin Schmidt, Harald Jensen