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).

  • Patent number: 6941742
    Abstract: 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: Grant
    Filed: May 10, 2000
    Date of Patent: September 13, 2005
    Assignee: Siemens Aktiengesellschaft
    Inventors: Ronald Neufert, Frank Witzel, Stefan Fischer, Günther Pajonk
  • Patent number: 6641785
    Abstract: 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: Grant
    Filed: August 16, 2000
    Date of Patent: November 4, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventors: Ronald Neufert, Frank Witzel
  • Patent number: 6589495
    Abstract: 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: Grant
    Filed: May 9, 2001
    Date of Patent: July 8, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventors: Stefan Fischer, Günther Pajonk, Frank Witzel
  • Patent number: 6576585
    Abstract: 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: Grant
    Filed: March 29, 2001
    Date of Patent: June 10, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventors: Stefan Fischer, Ronald Neufert, Günther Pajonk, Frank Witzel
  • Patent number: 6569394
    Abstract: 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: Grant
    Filed: May 25, 2001
    Date of Patent: May 27, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventors: Stefan Fischer, Günther Pajonk, Frank Witzel
  • Patent number: 6475952
    Abstract: 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: Grant
    Filed: November 7, 2001
    Date of Patent: November 5, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventors: Stefan Fischer, Günther Pajonk, Frank Witzel
  • Patent number: 6475453
    Abstract: 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: Grant
    Filed: August 12, 1998
    Date of Patent: November 5, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wieland Mathes, Lothar Hofmann, Frank Witzel
  • Patent number: 6401455
    Abstract: 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: Grant
    Filed: January 24, 2000
    Date of Patent: June 11, 2002
    Assignee: Siemens Aktiengesellschaft
    Inventors: Wieland Mathes, Frank Witzel, Steffen Schnapp
  • Publication number: 20020062577
    Abstract: 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: Application
    Filed: November 7, 2001
    Publication date: May 30, 2002
    Inventors: Stefan Fischer, Gunther Pajonk, Frank Witzel
  • Publication number: 20020004446
    Abstract: 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: Application
    Filed: May 25, 2001
    Publication date: January 10, 2002
    Inventors: Stefan Fischer, Gunther Pajonk, Frank Witzel
  • Publication number: 20010038814
    Abstract: 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: Application
    Filed: May 9, 2001
    Publication date: November 8, 2001
    Inventors: Stefan Fischer, Gunther Pajonk, Frank Witzel
  • Publication number: 20010025009
    Abstract: 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: Application
    Filed: March 29, 2001
    Publication date: September 27, 2001
    Inventors: Stefan Fischer, Ronald Neufert, Gunther Pajonk, Frank Witzel
  • Patent number: 6258436
    Abstract: 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: Grant
    Filed: May 22, 2000
    Date of Patent: July 10, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Günther Pajonk, Andreas Girschik, Robert Kleuderlein, Frank Witzel
  • Patent number: 6247303
    Abstract: 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: Grant
    Filed: November 16, 1999
    Date of Patent: June 19, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Stefan Bröer, Thomas Hammer, Frank Witzel
  • Patent number: 4609543
    Abstract: 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: Grant
    Filed: March 18, 1985
    Date of Patent: September 2, 1986
    Assignee: Nabisco Brands, Inc.
    Inventors: William M. Morris, Frank Witzel, Wayne J. Puglia, Donald A. M. Mackay, K. Warren Clark, Kanit J. Patanasinth
  • Patent number: 4581381
    Abstract: 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: Grant
    Filed: March 18, 1985
    Date of Patent: April 8, 1986
    Assignee: Nabisco Brands, Inc.
    Inventors: William M. Morris, Frank Witzel, Wayne J. Puglia, Donald A. M. Mackay, K. Warren Clark, K. J. Patanasinth
  • Patent number: 4533543
    Abstract: 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: Grant
    Filed: November 14, 1983
    Date of Patent: August 6, 1985
    Assignee: Nabisco Brands, Inc.
    Inventors: William M. Morris, Frank Witzel, Wayne J. Puglia, Donald A. M. Mackay, K. Warren Clark, Kanit J. Patanasinth
  • Patent number: 4409202
    Abstract: 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: Grant
    Filed: July 16, 1981
    Date of Patent: October 11, 1983
    Assignee: Nabisco Brands, Inc.
    Inventors: Frank Witzel, Mario A. DiNolfo, Burton Rodney, Donald A. M. Mackay
  • Patent number: 4357354
    Abstract: 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: Grant
    Filed: November 25, 1980
    Date of Patent: November 2, 1982
    Assignee: Nabisco Brands, Inc.
    Inventors: Gary Kehoe, Wayne J. Puglia, Frank Witzel, Dominick R. Friello, Donald A. M. Mackay
  • Patent number: 4352824
    Abstract: 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: Grant
    Filed: August 24, 1981
    Date of Patent: October 5, 1982
    Assignee: Nabisco Brands, Inc.
    Inventors: Wayne J. Puglia, Gary Kehoe, Frank Witzel, K. Warren Clark, Donald A. M. Mackay