Patents by Inventor Frank Witzel
Frank Witzel 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: 6941742Abstract: To reduce the number of particles in an exhaust gas (A), in particular in the exhaust gas (A) from an internal-combustion engine, sulfur dioxide SO2 which is contained in the exhaust gas (A) is at least partially catalytically oxidized, in the presence of ammonia NH3 in a catalytic converter system having a catalytic activity which increases in the direction of flow, to form sulfur trioxide SO3. The simultaneous presence of sulfur trioxide SO3 and ammonia NH3 in the exhaust-gas stream which is brought about in this way results in an agglomeration of the small and very small particles and reduction in the number thereof.Type: GrantFiled: May 10, 2000Date of Patent: September 13, 2005Assignee: Siemens AktiengesellschaftInventors: Ronald Neufert, Frank Witzel, Stefan Fischer, Günther Pajonk
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Patent number: 6641785Abstract: The invention relates to a catalytic converter and a method for cleaning the exhaust gas from an internal combustion engine which is operated with excess air. The catalytic converter has an active material made from the oxides TiO2, V2O5, CaO and SiO2, as well as WO3 and/or MoO3. An active material of this type has the property of using the SCR method to reduce to equal extents the levels of nitrogen oxides and hydrocarbons. The CO oxidation activity of a material of this type can be increased by metering in elements selected from the group consisting of Pt, Pd, Rh, Ru and Ir in any desired inorganic form.Type: GrantFiled: August 16, 2000Date of Patent: November 4, 2003Assignee: Siemens AktiengesellschaftInventors: Ronald Neufert, Frank Witzel
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Patent number: 6589495Abstract: Catalyst body for breaking down halogenated hydrocarbons, in particular dioxins and/or furans, having an active material which comprises titanium dioxide, carbon and at least one active component which is selected from the group consisting of oxides and mixed oxides of the transition metals, of the lanthanides, of the actinides, of the alkali metals and alkaline-earth metals, of aluminum, of tin and of silicon. In an off-gas flowing through the catalyst body, the levels of hydrocarbons contained therein are effectively reduced in part by adsorption and in part by oxidation, in particular at temperatures below 250° C.Type: GrantFiled: May 9, 2001Date of Patent: July 8, 2003Assignee: Siemens AktiengesellschaftInventors: Stefan Fischer, Günther Pajonk, Frank Witzel
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Patent number: 6576585Abstract: A process for producing a catalyst body includes providing titanium dioxide, tungsten trioxide, vanadium pentoxide, aluminum oxide, and/or silicon oxide for the catalyst body. A kneadable and/or shapable compound is processed to form a shaped body by extrusion or by coating of a support body. The shaped body is dried and is calcined to form an active compound. The calcined shaped body is artificially aged by a final heat treatment at a temperature higher than the calcination temperature to produce a catalyst body having a high resistance to deactivation at high temperatures. The starting materials include from 65 to 95% by weight of titanium dioxide, 2 to 30% by weight of tungsten trioxide, 0 to 2% by weight of vanadium pentoxide, preferably, less than 1.5%, 0.1 to 10% by weight of aluminum oxide, and 0.1 to 10% by weight of silicon dioxide. The final heat treatment is done is at 660 to 700° C., drying is at 20 to 100° C. prior to calcination, and calcination is at 400° C. to less than 700° C.Type: GrantFiled: March 29, 2001Date of Patent: June 10, 2003Assignee: Siemens AktiengesellschaftInventors: Stefan Fischer, Ronald Neufert, Günther Pajonk, Frank Witzel
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Patent number: 6569394Abstract: A gas stream that contains nitrogen oxides is passed, in the presence of a reducing agent, over a catalyst body with an active material that contains a zeolite and titanium dioxide. The zeolite is a hydrogen-ion-exchanged, acid zeolite. Even at temperatures above 450° C., the nitrogen oxides contained are still effectively converted into nitrogen and water.Type: GrantFiled: May 25, 2001Date of Patent: May 27, 2003Assignee: Siemens AktiengesellschaftInventors: Stefan Fischer, Günther Pajonk, Frank Witzel
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Patent number: 6475952Abstract: To produce a catalytically active material, titanium dioxide, together with an oxide or with a dissolved compound of tungsten and/or vanadium, is processed into a shapeable material. the shapeable material is dried to form a shaped body, and the shaped body is calcined. After the calcining, the shaped body is additionally impregnated with a dissolved compound of titanium and vanadium and is dried again. A catalytically active material of this type has a high catalytic activity with regard to breaking down dioxins and/or furans even in a temperature range of below 250° C. The catalytically active material is particularly suitable for producing dioxin and/or furan catalytic converters.Type: GrantFiled: November 7, 2001Date of Patent: November 5, 2002Assignee: Siemens AktiengesellschaftInventors: Stefan Fischer, Günther Pajonk, Frank Witzel
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Configuration for decomposing nitrogen oxides in a gas stream and method for using the configuration
Patent number: 6475453Abstract: A configuration for decomposing nitrogen oxides in a gas stream includes a plurality of catalytic converters disposed one after the other through which the gas stream can flow. Each of the catalytic converters has a honeycomb structure with many parallel cells through which the gas stream can flow. Each of the catalytic converters also has a predetermined cell density and a predetermined average level of activity defined as a proportion by weight of the catalytically active agent. The predetermined cell density of a second catalytic converter through which the gas stream flows after a first catalytic converter is lower than the predetermined cell density of the first catalytic converter. The predetermined average level of activity of the second catalytic converter is also higher than the predetermined average level of activity of the first catalytic converter. The configuration is preferably used in conjunction with an exhaust gas from a combustion drive unit.Type: GrantFiled: August 12, 1998Date of Patent: November 5, 2002Assignee: Siemens AktiengesellschaftInventors: Wieland Mathes, Lothar Hofmann, Frank Witzel -
Patent number: 6401455Abstract: An injection device for a reducing agent, a mixing device and a catalyst device are provided in an exhaust pipe. The mixing device is disposed upstream of the injection device as seen in the direction of flow of the exhaust gas. An exhaust gas inlet pipe is connected to the exhaust pipe along the main axis of the exhaust pipe. A first level of the catalyst device may advantageously be a hydrolysis-catalyst module, while the other levels may be SCR catalyst modules.Type: GrantFiled: January 24, 2000Date of Patent: June 11, 2002Assignee: Siemens AktiengesellschaftInventors: Wieland Mathes, Frank Witzel, Steffen Schnapp
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Publication number: 20020062577Abstract: To produce a catalytically active material, titanium dioxide, together with an oxide or with a dissolved compound of tungsten and/or vanadium, is processed into a shapeable material. The shapeable material is dried to form a shaped body, and the shaped body is calcined. After the calcining, the shaped body is additionally impregnated with a dissolved compound of titanium and vanadium and is dried again. A catalytically active material of this type has a high catalytic activity with regard to breaking down dioxins and/or furans even in a temperature range of below 250° C. The catalytically active material is particularly suitable for producing dioxin and/or furan catalytic converters.Type: ApplicationFiled: November 7, 2001Publication date: May 30, 2002Inventors: Stefan Fischer, Gunther Pajonk, Frank Witzel
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Publication number: 20020004446Abstract: A gas stream that contains nitrogen oxides is passed, in the presence of a reducing agent, over a catalyst body with an active material that contains a zeolite and titanium dioxide. The zeolite is a hydrogen-ion-exchanged, acid zeolite. Even at temperatures above 450° C., the nitrogen oxides contained are still effectively converted into nitrogen and water.Type: ApplicationFiled: May 25, 2001Publication date: January 10, 2002Inventors: Stefan Fischer, Gunther Pajonk, Frank Witzel
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Publication number: 20010038814Abstract: Catalyst body for breaking down halogenated hydrocarbons, in particular dioxins and/or furans, having an active material which comprises titanium dioxide, carbon and at least one active component which is selected from the group consisting of oxides and mixed oxides of the transition metals, of the lanthanides, of the actinides, of the alkali metals and alkaline-earth metals, of aluminum, of tin and of silicon. In an off-gas flowing through the catalyst body, the levels of hydrocarbons contained therein are effectively reduced in part by adsorption and in part by oxidation, in particular at temperatures below 250° C.Type: ApplicationFiled: May 9, 2001Publication date: November 8, 2001Inventors: Stefan Fischer, Gunther Pajonk, Frank Witzel
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Publication number: 20010025009Abstract: A process for producing a catalyst body includes providing titanium dioxide, tungsten trioxide, vanadium pentoxide, aluminum oxide, and/or silicon oxide for the catalyst body. A kneadable and/or shapable compound is processed to form a shaped body by extrusion or by coating of a support body. The shaped body is dried and is calcined to form an active compound. The calcined shaped body is artificially aged by a final heat treatment at a temperature higher than the calcination temperature to produce a catalyst body having a high resistance to deactivation at high temperatures. The starting materials include from 65 to 95% by weight of titanium dioxide, 2 to 30% by weight of tungsten trioxide, 0 to 2% by weight of vanadium pentoxide, preferably, less than 1.5%, 0.1 to 10% by weight of aluminum oxide, and 0.1 to 10% by weight of silicon dioxide. The final heat treatment is done is at 660 to 700° C., drying is at 20 to 100° C. prior to calcination, and calcination is at 400° C. to less than 700° C.Type: ApplicationFiled: March 29, 2001Publication date: September 27, 2001Inventors: Stefan Fischer, Ronald Neufert, Gunther Pajonk, Frank Witzel
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Patent number: 6258436Abstract: A catalyst body, which contains a number of passages through which a medium can flow in a preferred direction, is to be able to operate reliably with little cleaning outlay. It is also intended for cracking during the process of manufacturing the catalyst body to be particularly rare. For this purpose, each passage, disposed at right angles to the preferred direction, is approximately rectangular in cross section, as defined by a longitudinal side and a shorter transverse side. The number of passages per unit surface area lies in the range from 0.5 to 2.5 cm−2, and the longitudinal sides of a first group of the passages are disposed approximately at right angles to the longitudinal sides of a second group of the passages. The passages are in this case combined to form subgroups, the passages of each subgroup, in terms of their cross sections, forming an approximately square configuration, and each subgroup containing in each case passages from the same group.Type: GrantFiled: May 22, 2000Date of Patent: July 10, 2001Assignee: Siemens AktiengesellschaftInventors: Günther Pajonk, Andreas Girschik, Robert Kleuderlein, Frank Witzel
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Patent number: 6247303Abstract: To clean the exhaust gas of internal-combustion engines or other machines which are operated with fossil fuel, it is proposed to firstly pretreat the exhaust gas in a non-thermal normal-pressure gas discharge and subsequently allow a selective catalytic reduction of oxidic noxious substances to take place with the addition of a suitable reduction substance, or to allow a selective catalytic decomposition to take place. The device for removing the oxidic noxious substances is characterized by a series circuit of at least one module with a gas discharge section and at least one module with a catalytic-converter section, and is suitable in particular for use in a diesel engine.Type: GrantFiled: November 16, 1999Date of Patent: June 19, 2001Assignee: Siemens AktiengesellschaftInventors: Stefan Bröer, Thomas Hammer, Frank Witzel
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Patent number: 4609543Abstract: An improved deposited chewable antacid tablet containing solid antacid particles which includes solid antacid particles having a primary particle size of less than 100 millimicrons, which particles are thoroughly coated with a mixture composed of a fatty material or oil, a surfactant, and a flavorant selected from the group consisting of chocolate, mint-chocolate, butter, vanilla, butter fat and mint flavors. The fat or oil is present in an amount of from about 25% to about 45% of the mixture. As a result of the mixture coated on the antacid particles a non-chalky, non-gritty, antacid tablet is provided which readily disintegrates upon exposure to saliva as such way as to function as a liquid antacid.Type: GrantFiled: March 18, 1985Date of Patent: September 2, 1986Assignee: Nabisco Brands, Inc.Inventors: William M. Morris, Frank Witzel, Wayne J. Puglia, Donald A. M. Mackay, K. Warren Clark, Kanit J. Patanasinth
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Patent number: 4581381Abstract: An improved deposited chewable antacid tablet containing solid antacid particles which includes solid antacid particles having a primary particle size of less than 100 millimicrons, which particles are thoroughly coated with a mixture composed of a fatty material or oil, a surfactant, and a flavorant selected from the group consisting of chocolate, mint-chocolate, butter, vanilla, butter fat and mint flavors. The fat or oil is present in an amount of from about 25% to about 45% of the mixture. As a result of the mixture coated on the antacid particles a non-chalky, non-gritty, antacid tablet is provided which readily disintegrates upon exposure to saliva as such way as to function as a liquid antacid.Type: GrantFiled: March 18, 1985Date of Patent: April 8, 1986Assignee: Nabisco Brands, Inc.Inventors: William M. Morris, Frank Witzel, Wayne J. Puglia, Donald A. M. Mackay, K. Warren Clark, K. J. Patanasinth
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Patent number: 4533543Abstract: An improved deposited chewable antacid tablet containing solid antacid particles which includes solid antacid particles having a primary particle size of less than 100 millimicrons, which particles are thoroughly coated with a mixture composed of a fatty material or oil, a surfactant, and a flavorant selected from the group consisting of chocolate, mint-chocolate, butter, vanilla, butter fat and mint flavors. The fat or oil is present in an amount of from about 25% to about 45% of the mixture. As a result of the mixture coated on the antacid particles a non-chalky, non-gritty, antacid tablet is provided which readily disintegrates upon exposure to saliva as such way as to function as a liquid antacid.Type: GrantFiled: November 14, 1983Date of Patent: August 6, 1985Assignee: Nabisco Brands, Inc.Inventors: William M. Morris, Frank Witzel, Wayne J. Puglia, Donald A. M. Mackay, K. Warren Clark, Kanit J. Patanasinth
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Patent number: 4409202Abstract: A breath freshener composition is provided which may be in the form of a comestible, such as a pill, powder, tablet, pressed candy or mint, boiled candy, mouthwash, dental cream, chewing gum and the like, and which includes as its active ingredient a vegetable oil employed in combination with magnesium hydroxide or basic hydrated magnesium carbonate. The above breath freshener composition is especially effective in eliminating onion odor in the mouth and saliva. In addition, a method is provided for inhibiting bad breath wherein any of the above combinations are employed.Type: GrantFiled: July 16, 1981Date of Patent: October 11, 1983Assignee: Nabisco Brands, Inc.Inventors: Frank Witzel, Mario A. DiNolfo, Burton Rodney, Donald A. M. Mackay
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Patent number: 4357354Abstract: A reduced calorie chewing gum is provided which does not decrease in viscosity upon chewing and contains less than 65% water-solubles, such as sugars and/or sugar alcohols such as sweeteners, and includes gum base containing high levels of inert fillers, such as calcium carbonate or talc in amounts of at least about 40% by weight, softeners, such as lecithin, and optionally synthetic non-caloric sweeteners, such as aspartame, saccharin, or cyclamates. The chewing gum includes at least about 10% air voids entrapped in the gum base matrix which, upon chewing, become filled with moisture causing a dramatic increase in cud volume.Type: GrantFiled: November 25, 1980Date of Patent: November 2, 1982Assignee: Nabisco Brands, Inc.Inventors: Gary Kehoe, Wayne J. Puglia, Frank Witzel, Dominick R. Friello, Donald A. M. Mackay
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Patent number: 4352824Abstract: A chewing gum is provided which contains gum base and a non-aqueous solid fatty or gelatinous sweetener or flavorant, such as butter, marshmallow or caramel, solubilized in the gum base. The subject chewing gum has the appearance and mouth feel of chewing gum as opposed to candy and a delayed but prolonged sweetness or flavor impact. The chewing gum is laminated with a slab of chewing gum which will supply initial sweetness or flavor impact.A method for producing the above chewing gum is also provided.Type: GrantFiled: August 24, 1981Date of Patent: October 5, 1982Assignee: Nabisco Brands, Inc.Inventors: Wayne J. Puglia, Gary Kehoe, Frank Witzel, K. Warren Clark, Donald A. M. Mackay