Patents by Inventor Werner Steck
Werner Steck 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: 4420330Abstract: A process for stabilizing pyrophoric acicular metal particles consisting essentially of iron, by reaction with oxygen-containing gases in two stages, wherein, in the first stage, up to 1/3 of the passivating layer present in the final state is formed at from 25.degree. to 45.degree. C. and, in a subsequent second stage, the remainder of the passivating layer is formed at from 50.degree. to 70.degree. C.Type: GrantFiled: April 16, 1982Date of Patent: December 13, 1983Assignee: BASF AktiengesellschaftInventors: Helmut Jakusch, Werner Loeser, Eberhard Koester, Peter Rudolf, Werner Senkpiel, Werner Steck
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Patent number: 4378240Abstract: A process for the preparation of acicular ferromagnetic metal particles, consisting essentially of iron, by reducing acicular iron oxides and/or iron oxide hydroxides, which are either pure or are modified with conventional foreign metal ions, by means of a gaseous reducing agent in a fluidized bed furnace in which a stirrer is provided immediately above the fluidizing grid.Type: GrantFiled: May 28, 1981Date of Patent: March 29, 1983Assignee: BASF AktiengesellschaftInventors: Hansjoerg Siegle, Hans H. Reich, Horst Autzen, Werner Steck, Werner Loeser, Eckhard Hetzel, Manfred Ohlinger
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Patent number: 4367214Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by heating iron(III) oxide or iron(III) oxide hydroxide at 220.degree.-460.degree. C. under a water vapor partial pressure of not less than 30 mbar, reducing the resulting product to magnetite by means of hydrogen and/or CO and/or an organic compound which can decompose in the presence of iron oxide, and then oxidizing the magnetite with an oxygen-containing gas to give acicular ferrimagnetic iron oxide of the formula FeO.sub.X, where X is from 1.33 to 1.50.Type: GrantFiled: July 31, 1980Date of Patent: January 4, 1983Assignee: BASF AktiengesellschaftInventors: Wilhelm Sarnecki, Laszlo Marosi, Horst Autzen, Manfred Ohlinger, Werner Steck
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Patent number: 4360377Abstract: Ferromagnetic metal particles, consisting essentially of iron and comprising a core, containing not less than 85% by weight of metallic iron, and an iron oxide plus chromium oxide surface layer surrounding this core, which layer additionally contains one or more elements selected from the group comprising zinc, phosphorus in the form of phosphate, aluminum, calcium, strontium, barium, cadmium, lead, cobalt and nickel in a total amount of not more than 9.5% by weight, based on the total amount of the metal particles, and a process for the production of such particles.Type: GrantFiled: June 29, 1981Date of Patent: November 23, 1982Assignee: BASF AktiengesellschaftInventors: Werner Steck, Hermann Roller, Wilhelm Sarnecki, Werner Balz
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Patent number: 4344791Abstract: A process for the manufacture of acicular ferromagnetic iron particles by heating a goethite, provided with a shape-stabilizing surface coating, at 250.degree.-450.degree. C. in an atmosphere containing water vapor at a partial pressure of not less than 30 mbar, to give alpha-iron(III) oxide, and reducing this material with hydrogen at 275.degree.-425.degree. C., and the use of the iron particles thus obtained as magnetic material in the production of magnetic recording media.Type: GrantFiled: July 31, 1980Date of Patent: August 17, 1982Assignee: BASF AktiengesellschaftInventors: Werner Steck, Wilhelm Sarnecki, Laszlo Marosi, Manfred Ohlinger, Werner Loeser
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Patent number: 4296149Abstract: A process for the manufacture of acicular magnetic iron oxide consisting of a core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 percent by weight of cobalt(II) ions and from 0.1 to 15 percent by weight of iron(II) ions, wherein a solution containing cobalt(II) hydroxide and iron(II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100.degree.-220.degree. C.Type: GrantFiled: January 29, 1980Date of Patent: October 20, 1981Assignee: BASF AktiengesellschaftInventors: Peter Rudolf, Werner Steck, Helmut Jakusch, Guenter Vaeth, Christof Jaeckh
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Patent number: 4295879Abstract: A process for the manufacture of acicular ferromagnetic iron particles by reducing an iron(III) oxide which carries a shape-stabilizing surface coating and has been produced by heating acicular iron(III) oxide hydroxide at 250.degree.-390.degree. C. in an atmosphere containing water vapor at a partial pressure of not less than 30 mbar, with hydrogen at 275.degree.-425.degree. C.Type: GrantFiled: July 31, 1980Date of Patent: October 20, 1981Assignee: BASF AktiengesellschaftInventors: Werner Steck, Wilhelm Sarnecki, Laszlo Marosi, Manfred Ohlinger, Horst Autzen
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Patent number: 4287233Abstract: A process for the manufacture of acicular magnetic iron oxide consisting of core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 per cent by weight of cobalt(II) ions and from 0.1 to 15 per cent by weight of iron(II) ions, wherein a precipitate of cobalt(II) hydroxide and iron (II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100.degree.-200.degree. C.Type: GrantFiled: January 29, 1980Date of Patent: September 1, 1981Assignee: BASF AktiengesellschaftInventors: Peter Rudolf, Werner Steck, Eberhard Koester, Manfred Ohlinger, Christof Jaeckh
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Patent number: 4272563Abstract: A process for the manufacture of wear-resistant magnetic recording media comprising a dimensionally stable base, a thin ferromagnetic metal layer, containing cobalt and/or nickel, firmly bonded thereto and a thin protective layer applied thereon. The protective layer is produced by treating the recording medium in a liquid basic medium, containing gaseous oxygen, for from 1 to 60 minutes at from 5.degree. to 70.degree. C., washing and drying the treated recording medium and then heating it in air at from 170.degree. to 300.degree. C. This method offers a particularly simple way of providing the ferromagnetic layer of the recording medium with a thin but uniform, mechanically stable and wear-resistant protective layer.Type: GrantFiled: February 3, 1977Date of Patent: June 9, 1981Assignee: BASF AktiengesellschaftInventors: Werner Steck, Werner Loeser, Manfred Steuerwald, Gerd Wunsch, Paul Deigner
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Patent number: 4259368Abstract: A process for the manufacture of acicular magnetic iron oxides which consist of a core of gamma-iron(III) oxide and a shell of a magnetite modified with zinc(II) ions and/or manganese(II) ions and which contain, based on the total modified gamma-iron(III) oxide, from 0.1 to 20 percent by weight of iron(II) ions, from 0.1 to 10 percent by weight of zinc(II) ions and/or from 0.1 to 10 percent by weight of manganese(II) ions.Type: GrantFiled: April 8, 1980Date of Patent: March 31, 1981Assignee: BASF AktiengesellschaftInventors: Peter Rudolf, Werner Steck, Wilhelm Sarnecki, Christof Jaeckh
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Patent number: 4221776Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by reducing heat-treated acicular iron(III) oxide hydroxide with an organic compound which decomposes in the presence of iron oxide at from 450.degree. to 650.degree. C., followed by at least partial oxidation with an oxygen-containing gas at from 200.degree. to 500.degree. C., wherein the iron(III) oxide hydroxide employed is heat-treated at from 450.degree. to 700.degree. C. and has a surface area, measured by the BET method, of from 10 to 23 m.sup.2 /g.Type: GrantFiled: January 25, 1979Date of Patent: September 9, 1980Assignee: BASF AktiengesellschaftInventors: Horst Autzen, Helmut Jakusch, Eberhard Koester, Werner Loeser, Peter Rudolf, Wilhelm Sarnecki, Werner Steck
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Patent number: 4213959Abstract: A process for the manufacture of acicular ferrimagnetic iron oxide by dehydrating acicular iron(III) oxide hydroxides to give acicular iron(III) oxides, then reducing these iron(III) oxides at from 300.degree. to 650.degree. C. by means of an organic compound which decomposes in this temperature range, and oxidizing the reduced product with an oxygen-containing gas at from 200.degree. to 500.degree. C., wherein the acicular iron(III) oxide hydroxides employed consist of a mixture of goethite and lepidocrocite, containing at least 60% of the latter, and the dehydration is carried out at from 250.degree. to 700.degree. C.Type: GrantFiled: August 3, 1978Date of Patent: July 22, 1980Assignee: BASF AktiengesellschaftInventors: Rudolf Brodt, Helmut Jakusch, Eberhard Koester, Werner Loeser, Manfred Ohlinger, Wilhelm Sarnecki, Werner Steck
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Patent number: 4188302Abstract: A process for the manufacture of an acicular magnetic iron oxide containing from 0.5 to 10 percent by weight of cobalt and up to 24 percent by weight of divalent iron, each based on the amount of iron(III) oxide, wherein an aqueous suspension of gamma-iron(III) oxide, containing cobalt(II) and iron(II) ions, the suspension having a hydroxyl ion concentration of more than 3.6.times.10.sup.-6 moles/liter, is heated at from 50.degree. to 100.degree. C. for at least 15 minutes, and the resulting precipitate is filtered off, washed until neutral, dried at below 100.degree. C. and thereafter heated at from 100.degree. to 200.degree. C.The products thus obtained give, even when their cobalt content is low, a very high coercive force, while the effect of temperature on the coercive force and residual induction is very slight.Type: GrantFiled: January 25, 1978Date of Patent: February 12, 1980Assignee: BASF AktiengesellschaftInventors: Hans-Juergen Becker, Christof Jaeckh, Eberhard Koester, Werner Loeser, Manfred Ohlinger, Werner Steck
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Patent number: 4178171Abstract: A process for the manufacture of acicular ferromagnetic iron particles by reducing acicular iron(III) oxide hydroxides which consist of pure synthetic lepidocrocite or a mixture of synthetic goethite and at least 70% by weight of synthetic lepidocrocite.The iron(III) oxide hydroxides used carry, on their surface, an alkaline earth metal cation and an anion of a monobasic, dibasic or tribasic aliphatic carboxylic acid of up to 6 carbon atoms or an organic compound containing at least two groups capable of chelating the alkaline earth metal cation, and are produced in such a way that they consist of at least 70 percent by weight of lepidocrocite and have a length-to-width ratio of not less than 15:1.Reduction of such iron(III) oxide hydroxides gives iron particles with pronounced shape anisotropy, which exhibit both good magnetic properties and a narrow field strength distribution.Type: GrantFiled: March 20, 1978Date of Patent: December 11, 1979Assignee: BASF AktiengesellschaftInventors: Werner Steck, Rudolf Brodt, Wilhelm Sarnecki, Helmut Jakusch, Manfred Ohlinger, Eberhard Koester
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Patent number: 4165232Abstract: A process for the manufacture of acicular ferromagnetic metal particles which essentially consist of iron and carry, on their surface, from 0.02 to 0.6% by weight of boron in the form of a borate, by reducing an acicular iron oxide with a gaseous reducing agent at from 250.degree. to 500.degree. C., wherein a compound selected from the group comprising boron oxyacids and their inorganic salts is precipitated on the said iron oxide before reduction.Type: GrantFiled: September 15, 1978Date of Patent: August 21, 1979Assignee: BASF AktiengesellschaftInventors: Christof Jaeckh, Werner Steck, Rudolf Brodt, Manfred Ohlinger, Werner Loeser, Eberhard Koester
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Patent number: 4155748Abstract: A method of preparing acicular ferromagnetic metal particles consisting essentially of iron and suitable for magnetic recording, said particles being modified at the surface with 0.02 to 0.2% by weight of carbon and with 0.5 to 1.9% by weight of phosphorus as phosphate, by reducing a finely divided acicular iron compound, wherein there are deposited on said iron compound, prior to reduction, (a) a hydrolysis-resistant substance selected from the group consisting of oxyacids of phosphorus, their esters and inorganic salts, and (b) a compound selected from the group consisting of aliphatic monobasic, dibasic and tribasic carboxylic acids of from 1 to 6 carbon atoms.Type: GrantFiled: September 29, 1977Date of Patent: May 22, 1979Assignee: BASF AktiengesellschaftInventors: Werner Steck, Hans H. Schneehage, Christof Jaeckh, Werner Huebner, Manfred Ohlinger, Werner Loeser
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Patent number: 4128672Abstract: A process for the manufacture of rigid magnetic recording media by depositing a cobalt-containing ferromagnetic metal layer on a non-magnetic metallic base disc provided with a cured layer of binder which does not dissolve or swell in organic solvents and contains non-magnetic pigments, and which has been activated, before deposition of the ferromagnetic layer, by treatment with a solution of a palladium (O) complex in an organic solvent, followed by decomposition of this complex, to prepare it to receive the ferromagnetic metal layer which is produced by electroless deposition.Type: GrantFiled: October 24, 1975Date of Patent: December 5, 1978Assignee: BASF AktiengesellschaftInventors: Gerd Wunsch, Paul Deigner, Roland Falk, Karl Mahler, Werner Loeser, Friedrich Domas, Peter Felleisen, Werner Steck
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Patent number: 4061726Abstract: Goethite is obtained by reacting an aqueous solution of an iron (II) salt with an aqueous solution of an alkali metal hydroxide and oxidizing the resulting iron(II) hydroxide. The oxidation is carried out in three stages. In the first stage, from 4 to 15% by weight are oxidized in the course of from 0.4 to 5 hours, in the second stage from 60 to 85% by weight are oxidized in the course of from 1.5 to 6 hours and in a third stage the remaining amount of iron is oxidized.Type: GrantFiled: October 15, 1976Date of Patent: December 6, 1977Assignee: BASF AktiengesellschaftInventors: Manfred Ohlinger, Eduard Schoenafinger, Guenter Vaeth, Heinz Stritzinger, Eberhard Koester, Hans Henning Schneehage, Werner Steck
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Patent number: 3993807Abstract: A process for metallizing substrates by activation of the substrate by deposition of palladium from a palladium complex, followed by electroless metallization. The palladium is deposited on the substrate by dipping the substrate into a solution of a palladium(O) complex and decomposing this complex at from 100.degree. to 300.degree. C.With this method it is possible to effectively activate substrates which are attacked by acid or alkali or swollen by organic solvents.Type: GrantFiled: October 24, 1975Date of Patent: November 23, 1976Assignee: BASF AktiengesellschaftInventors: Joachim Stabenow, Gerd Wunsch, Paul Deigner, Franz-Josef Mueller, Werner Loeser, Werner Steck
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Patent number: 3961990Abstract: A process for the manufacture of magnetic materials containing a phase A with a ferromagnetic spin system, of composition Co.sub.x Ni.sub.1.sub.-x and a phase B with an antiferromagnetic spin system of composition (CoO).sub.x (NiO).sub.1.sub.-x , with values of x from 0.05 to 0.96, the phases A and B showing exchange interaction. The materials are manufactured by surface oxidation of starting materials having a ferromagnetic layer, at least on the surface but optionally extending deeper, of composition A, to produce the antiferromagnetic phase B, nitrous oxide being used as the oxidant. Magnetic materials thus obtained have an asymmetrical hysteresis loop, which manifests itself at different temperatures, namely the particular Neel temperature of the phase B, which depends on the composition of the phases which varies in accordance with the values of x.Type: GrantFiled: December 23, 1974Date of Patent: June 8, 1976Assignee: BASF AktiengesellschaftInventors: Eberhard Koester, Gerd Wunsch, Paul Deigner, Karl Uhl, Werner Stumpfi, Werner Steck