Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 5830421 | Material and system for catalytic reduction of nitrogen oxide in an exhaust stream of a combustion process A catalytic material of activated hydrous metal oxide doped with platinum, palladium, or a combination of these, and optionally containing an alkali or alkaline earth metal, that is effective for NOX reduction in an oxidizing exhaust stream fro... | 11/03/1998 |
| 5821190 | Catalyst comprising iridium, alkaline metal, alkaline earth or rare earth metal, and metal carbide or metal nitride The present invention provides a catalyst and method for purifying exhaust gases, having superior performance of NOx purification to exhaust gases containing oxygen and nitrogen oxides, particularly superior performance of NOx elimination to exhaust gases... | 10/13/1998 |
| 5817521 | Method for detection of performance reduction of exhaust gas purification catalyst A method for detecting the performance reduction of an exhaust gas purification catalyst by examining the temperature of an exhaust gas flowing into the catalyst, necessary for the activation of the catalyst. This method enables accurate detection of the ... | 10/06/1998 |
| 5814287 | Polymerization catalyst enhanced hydrocarbon trapping process This invention is directed to a catalyst system for treating internal combustion engine exhaust gases, the system having enhanced hydrocarbon trapping efficiency which is particularly advantageous during cold start. The system comprises a hydrocarbon poly... | 09/29/1998 |
| 5814576 | Catalyst for purifying exhaust gas and method of producing same A catalyst for purifying exhaust gas from an automotive internal combustion engine. The catalyst comprises a monolithic carrier which is coated with a catalyst component carrying layer which includes rhodium and a zirconium oxide. The zirconium oxide cont... | 09/29/1998 |
| 5811067 | Catalytic method for selectively reducing nitrogen oxides A method for the catalytic removal of nitrogen oxides, methane and carbon monoxide out of oxygen-rich exhaust gases emitted from motors that may combust natural gas by contacting the exhaust gas with a zeolite of the NFI structure that contains palladium.... | 09/22/1998 |
| 5811364 | Catalyst system for the purification of exhaust gas A catalyst system for the purification of exhaust gas comprises at least two catalysts disposed on an exhaust system side of an engine and at least containing palladium as a catalyst component. In this case, each of catalysts disposed on upstream side and... | 09/22/1998 |
| 5804152 | Method for purifying exhaust gases An automotive exhaust catalyst includes a support, which is less likely to adsorb SOx contained in exhaust gases thereon, an NOx storage compound loaded on the support, and a noble metal element loaded on the support. The support is ... | 09/08/1998 |
| 5801114 | Catalysts selective for the reduction of nitrogen oxides to nitrogen in an oxidizing medium, a process for their preparation and their use A catalyst which is active and selective for the reduction of nitrogen oxides to molecular nitrogen by reducing agents in a medium which is superstoichiometric in oxidizing agents such as carbon monoxide, hydrogen, hydrocarbons, alcohols and other oxygen-... | 09/01/1998 |
| 5795553 | Nitrogen oxide adsorbing material A material effective for adsorbing NOx from an exhaust stream of a combustion process, such as from an internal combustion engine operating under lean burn conditions, is disclosed. The material comprises an alkali metal-doped and copper-doped ... | 08/18/1998 |
| 5792436 | Method for using a regenerable catalyzed trap A method of at least periodically removing from a lean gaseous stream a sorbable component such as SOx includes passing the gaseous stream through a trap member having an oxidation catalyst combined with a sorbent material at a temperature with... | 08/11/1998 |
| 5786031 | Barrier for a metal substrate A barrier is formed on a metal substrate by coating the substrate with a metal oxide, calcining the substrate, impregnating the coated substrate with an acid, and calcining the impregnated coating at a temperature high enough to cause the metal oxide to f... | 07/28/1998 |
| 5783160 | Method for purifying combustion exhaust gas The method for purifying combustion exhaust gas according to the present invention utilizes a NH3 decomposing catalyst. The NH3 decomposing catalyst in the present invention is capable of converting substantially all of the NH3 | 07/21/1998 |
| 5780384 | Hydrated manganese dioxide oxidation catalysts and process of producing same The present invention generally relates to supported mono charged cation delta manganese dioxide hydrate having a noble metal on the surface thereof, and to the use thereof for low temperature oxidation of volatile organic compounds (VOCs), particularly o... | 07/14/1998 |
| 5780002 | Exhaust gas cleaner and method for cleaning exhaust gas An exhaust gas cleaner is constituted of an Ag catalyst carrying an Ag component and a base metal catalyst carrying a Cu component and optionally W, V, Mo components, and a noble metal catalyst carrying a noble metal component. The base metal catalyst and... | 07/14/1998 |
| 5776423 | Trimetallic zeolite catalyst and method of NOx abatement using the same A catalytic material useful for the abatement of NOX in a lean environment containing a zeolite material having incorporated therein copper, cobalt and iron as catalytically active species. The catalytically active metals are preferably incorpo... | 07/07/1998 |
| 5772972 | Catalyst/hydrocarbon trap hybrid system The invention is an automotive catalyst system for treating internal combustion engine exhaust gases. The system comprises a hybrid system of hydrocarbon trapping material and palladium based three-way catalyst material, the hydrocarbon trapping material ... | 06/30/1998 |
| 5766562 | Diesel emission treatment using precious metal on titania aerogel The invention is a method for treating exhaust gases generated by a diesel engine by providing a sulfur-tolerant lean-NOx catalyst in an exhaust gas passage of the engine and contacting the catalyst with the exhaust gases. The sulfur-tolerant lean-NOx cat... | 06/16/1998 |
| 5762892 | Process for purifying exhaust gases A catalyst for purifying carbon monoxide, hydrocarbons and nitrogen oxides in exhaust gases at the stoichiometric point or in oxygen-rich atmosphere, is disclosed, and it includes a porous support, at least one noble metal catalyst ingredient loaded on th... | 06/09/1998 |
| 5756057 | Method for removal of nitrogen oxides from exhaust gas The removal of nitrogen oxides from an exhaust gas is accomplished by a method which comprises causing the exhaust gas in an oxidizing atmosphere to contact a catalyst comprising a refractory inorganic oxide and catalytically active components, the compon... | 05/26/1998 |
| 5753580 | Exhaust emission control catalyst comprising cerium A bottom washcoat layer 2 and a top washcoat layer 3 including alumina (Al2 O3) are sequentially laminated onto the surface of a monolith carrier 1. Cerium, zirconium and palladium are carried in the bottom washcoat layer 2, and plat... | 05/19/1998 |
| 5750082 | Nox trap with improved performance The invention is a nitrogen oxide trap separate catalyst phases. One of the phases is platinum on a porous support and another is alkali metal or elements and alkaline earth elements on another porous support. The phases may be provided as an intimate mix... | 05/12/1998 |
| 5747410 | Exhaust gas cleaner and method of cleaning exhaust gas Nitrogen oxides are removed from an exhaust gas containing nitrogen oxides and oxygen in an amount larger than its stoichiometric amount relative to unburned components in the exhaust gas, by using an exhaust gas cleaner having Ag supported by a porous in... | 05/05/1998 |
| 5744112 | Method for cleaning exhaust gas A method of cleaning an exhaust gas using an exhaust gas cleaner constituted by a first catalyst comprising a first porous inorganic oxide supporting an Ag component, a W component and a Pt component and optionally a second catalyst comprising a second po... | 04/28/1998 |
| 5741468 | Exhaust gas cleaner and method for cleaning exhaust gas An exhaust gas cleaner is constituted by a first catalyst carrying an Ag component, a second catalyst carrying an Ni component or two or more of an Ni component, Ag component and Cu component, and optionally a third catalyst carrying a noble metal compone... | 04/21/1998 |
| 5741467 | Palladium catalyst washcoat supports for improved methane oxidation in natural gas automotive emission catalysts The invention provides a catalyst which can convert methane, carbon monoxide, and nitrogen oxides in lean, stoichiometric, and rich air/fuel environments. Support (A) of the catalyst comprises an alumina support impregnated with Pd providing lean methane ... | 04/21/1998 |
| 5736114 | Spinel-based catalysts for reducing exhaust emissions of NOx Oxygen-rich exhaust gases, for example those emanating from internal combustion engines, e.g., diesel engines, are catalytically treated/converted to reduce emissions of NOx, in the presence of a catalytically effective amount of either (a) a s... | 04/07/1998 |
| 5714130 | Exhaust gas cleaner and method for cleaning exhaust gas An exhaust gas cleaner is constituted by a first Ag catalyst, a second Ag catalyst, a transition metal catalyst selected from the group consisting of a Pt catalyst, a W catalyst, a W+Pt catalyst and a mixed catalyst of the Pt catalyst and the W catalyst. ... | 02/03/1998 |
| 5702675 | Catalyst for purifying exhaust gases and process for producing the same A catalyst for purifying exhaust gases, which is composed of a catalyst substrate, a first porous support layer supporting barium as a NOx-occluding material and palladium, which is formed on the catalyst support, and a second porous support layer support... | 12/30/1997 |
| 5688740 | Three-way catalyst for treating exhaust gases A three-way conversion catalyst useful for the treatment of exhaust gas streams to accomplish the catalytic oxidation of carbon monoxide and hydrocarbons and the catalytic reduction of the oxides of nitrogen has a catalyst carrier such as cordierite coate... | 11/18/1997 |
| 5681788 | Catalysts for the purification of exhaust gas A catalyst for the purification of exhaust gas comprises a first coat layer of a palladium-carried activated alumina containing Ce, Zr and La formed on a honeycomb carrier, a second coat layer of an activated alumina containing Ce, Zr and La formed on the... | 10/28/1997 |
| 5676912 | Process for exhaust gas NOx, CO, and hydrocarbon removal There is provided a multizone catalytic process for the treatment of exhaust gas comprising nitrogen oxides, hydrocarbons, and carbon monoxide. In the multizone catalytic process, the exhaust gas is directed through a first zone, a second zone, and a thir... | 10/14/1997 |
| 5670443 | Exhaust gas cleaner and method for cleaning exhaust gas An exhaust gas cleaner constituted by a first catalyst comprising a first porous inorganic oxide supporting an Ag component, a W component and a Pt component and optionally a second catalyst comprising a second porous inorganic oxide supporting a Pt compo... | 09/23/1997 |
| 5665322 | Method of cleaning exhaust gas An exhaust gas cleaner having a heat-resistant, porous foam-type filter as a carrier, the filter being constituted by two portions consisting of a portion having a relatively low density and a high-density, thin layer portion formed on one side of the low... | 09/09/1997 |
| 5662869 | Exhaust gas purification method and apparatus therefor An exhaust gas purification system includes an adsorbent containing an adsorbent element for adsorbing harmful compounds such as hydrocarbon in an exhaust gas and a catalyst containing a catalyst element for lowering the harmful compounds in the exhaust g... | 09/02/1997 |
| 5660800 | Emissions control system and method An exhaust gas emissions control system lowers cold-start hydrocarbon emissions by using heat exchange structure to lower the temperature of exhaust gas prior to the exhaust gas passing through a hydrocarbon adsorbent and using the extracted heat to heat ... | 08/26/1997 |
| 5645804 | Method for cleaning exhaust gas containing nitrogen oxides The method of cleaning an exhaust gas containing nitrogen oxides including disposing an exhaust gas cleaner comprising a heat-resistant, porous body, which may support a catalyst consisting essentially of (a) at least one of alkali metal elements; (b) at ... | 07/08/1997 |
| 5643543 | Catalyst for treatment of exhaust gases from an internal combustion engine A catalyst for the treatment of exhaust gases from an internal combustion engine comprises a support including a porous layer which latter includes at least one inorganic refractory oxide and an active phase containing at least cerium, iron and platinum, ... | 07/01/1997 |
| 5628975 | Method for purifying exhaust gas from a diesel engine A method for purifying exhaust gases from a diesel engine is provided. The method utilizes a flow through type honeycomb catalyst having parallel through-cells and (1) a cross-sectional area at the inlet part of an exhaust gas cut by a face vertical to th... | 05/13/1997 |
| 5622680 | Post-combustion catalysts The invention relates to catalysts for the treatment of combustion gases. The catalysts include an active phase of the perovskite having the general formula: Lx L'1-x My M'z $c;1-y-z O3, ... | 04/22/1997 |
