Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6395246 | Preparation of calcium silicate and sulfur dioxide Nascent hydrogen and nascent oxygen are used to convert calcium sulfate and silicon dioxide to calcium silicate and sulfur dioxide.... | 05/28/2002 |
| 6146612 | Method for recovering sulfuric acid from sulfate salts A process is provided for the recovery of sulfuric acid from NH4 HSO4 and (NH4)2 SO4 salts produced from the sulfuric acid hydrolysis of methylmercaptopropionaldehyde (MMP) cyanohydrin to produce 2-hy... | 11/14/2000 |
| 6024932 | Method for the conversion of gypsum to elemental sulfur A process for the recovery of sulfur and carbon monoxide from metal sulfates in which the carbon monoxide is recycled as a reducing agent for reaction with the metal sulfate. Metal sulfates such as gypsum (calcium sulfate dihydrate) are processed to form ... | 02/15/2000 |
| 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 |
| 5769940 | Process for producing cement and elemental sulfur from a flue gas desulfurization waste product Cement and elemental sulfur are produced by forming a moist mixture of a flue gas desulfurization process waste product containing 80-95 percent by weight calcium sulfate hemihydrate and 5-20 percent by weight calcium sulfate hemihydrate, aluminum, iron, ... | 06/23/1998 |
| 5766339 | Process for producing cement from a flue gas desulfurization process waste product Cement is produced by forming a moist mixture of a flue gas desulfurization process waste product containing 80-95 percent by weight calcium sulfite hemihydrate and 5-20 percent by weight calcium sulfate hemihydrate, aluminum, iron, silica and carbon, agg... | 06/16/1998 |
| 5741469 | Process scheme for SOx removal from flue gases A dry, regenerable solid oxide process directed to convert SOx from the flue gas stream from a power plant, a coal or oil-fired plant or process heat furnace, or an FCC regenerator to elemental sulfur without using a Claus unit, a hydrogen plan... | 04/21/1998 |
| 5730950 | Sulfuric acid waste recycling by regenerative process The process will recover sulfuric acid on the 90-95% concentration range by roasting of ferrous sulfate hydrate crystals at high temperature under retort conditions. In the first step of the recovery process 6 (see FIG. 1) hydroxide slurry is reacted with... | 03/24/1998 |
| 5728358 | Sox sorbent regeneration There is provided a process directed to the use of gases containing or mixed with carbon monoxide, such as synthesis gas, to aid in the regeneration of sulfur oxide-sorbed solid oxides, such as magnesium aluminates or spinels. This process is especially u... | 03/17/1998 |
| 5628976 | Cofiring biosolids in a spent sulfuric acid regeneration facility A process for increasing throughput in a spent sulfuric acid dissociation furnace by injecting dewatered biosolids pre-conditioned to enhance combustion into the furnace while enriching the oxygen content of the air used in the process.... | 05/13/1997 |
| 5516498 | Process for the removal of sulfur dioxide from gases Process for the removal of sulphur dioxide from gases containing sulphur dioxide and oxygen, in which process these gases are brought into contact with a copper-containing acceptor which contains copper on a thermostable, inert support, the charged accept... | 05/14/1996 |
| 5458861 | Desulfurizing a gas stream A multi-bed process of removing sulfur oxides and/or other combustible sulfur-containing compounds from a gas stream including combusting the other combustible sulfur-compounds when present in the gas stream with air or oxygen to convert such sulfur-conta... | 10/17/1995 |
| 5286465 | Hydrometallurgical process for recovering iron sulfate and zinc sulfate from baghouse dust A process for recovering zinc/rich and iron-rich fractions from the baghouse dust that is generated in various metallurgical operations, especially in steel-making and other iron-making plants, comprises the steps of leaching the dust by hot concentrated ... | 02/15/1994 |
| 5271919 | Process for the thermal decomposition of metal sulphates A process for the thermal decomposition of metal sulphate mixtures at temperatures from 800° to 1100° C. under oxidizing conditions, in which the metal sulphate mixtures are mixed with roasting residue and reacted together with fuels in the decompositio... | 12/21/1993 |
| 5130112 | Method for recovering high grade process energy from a contact sulfuric acid process An improved process for the recovery of high grade energy from a contact sulfuric acid manufacturing process. Improvements include: injection of steam between an intermediate catalyst stage and a heat recovery absorption tower and/or a heat exchanger for ... | 07/14/1992 |
| 5124008 | Method of extraction of valuable minerals and precious metals from oil sands ore bodies and other related ore bodies A method for the extraction of valuable minerals and precious metals from oil sands ore bodies or other related ore bodies that is synergistically unique in the arrangement of processes for production of valuable minerals and precious metals in an economi... | 06/23/1992 |
| 5066474 | Method for sulfur dioxide production from calcium sulfate by entrained high-temperature slagging reduction A method for production of sulfur dioxide from calcium sulfate by high temperature thermal reduction. Calcium sulfate, preferably in the form of calcined phosphogypsum, is desulfurized using a fossil fuel as a heat source, the combustion products resultin... | 11/19/1991 |
| 4990319 | Process for producing ammonia and sulfur dioxide A process for producing NH3 and SO2 from ammonium sulfate, which comprises (i) reacting ammonium sulfate with a metal oxide or hydroxide at a temperature of not more than 200° C. to form NH3, water and a metal sulfate and... | 02/05/1991 |
| 4971781 | Working up sodium sulfate-containing residues Sodium sulfate-containing residues are worked up by reducing the sulfate by a process in which the sulfate or a mixture or solution of the sulfate is thermally cleaved by adding oxygen, air or oxygen-enriched air at above 1000° C., in particular above 12... | 11/20/1990 |
| 4963513 | Coal gasification cogeneration process The present invention relates to the coproduction of a combustible gas stream usable as an energy source, a sulfur-dioxide-containing second gas stream usable as a source of oxidant in the gasification of coal, and a sulfur-dioxide-containing third gas st... | 10/16/1990 |
| 4824655 | Process for the preparation of sulphur dioxide A process for the preparation of sulphur dioxide by the thermal decomposition of metal sulphates in a fluidized bed reactor with sulphur-containing reducing agents and energy suppliers, characterized in that a mixture comprising the metal sulphates, the s... | 04/25/1989 |
| 4744969 | Process for the conversion of coal and gypsum to valuable products The present invention relates to the coproduction of a combustible feed gas stream useable as an energy source and a sulfur-containing second gas stream useable as a feedstock for the production of sulfuric acid. The process includes heating coal in the p... | 05/17/1988 |
| 4734272 | Phospho-gypsum recovery process This disclosure involves a process for treating wet phospho-gypsum, a by-product from wet phosphoric acid manufacture, to remove fluorine values so as to make the sulfur values in the phospho-gypsum usable in making sulfuric acid in a contact sulfuric aci... | 03/29/1988 |
| 4608238 | Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid This disclosure concerns an improved phospho-gypsum recovery process in which phospho-gypsum waste product and coke are first heated to remove moisture, some SO2 and other vaporous matter, then heated to a higher temperature in a reducing atmos... | 08/26/1986 |
| 4415543 | Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid This disclosure concerns a process for treating phospho-gypsum waste product from the wet process method of making phosphoric acid including the steps of water washing the phospho-gypsum to remove all but an acceptable level of fluorine before the phospho... | 11/15/1983 |
| 4312842 | Process of manufacture of phosphoric acid with recovery of co-products An improved process for the wet-acid process for manufacture of phosphoric acid with recovery of valuable co-products is provided. Phosphate rock is digested in a sulfuric acid/phosphoric acid mixture. Phosphoric acid is filtered from the digested rock, t... | 01/26/1982 |
| 4304759 | Process for obtaining metal oxide and SO2 -containing gases essentially free of SO3 and H2 SO4 from ferrous sulphate containing salt The invention provides a process for thermally decomposing salts, containing mainly ferrous sulfate wherein said feed material is contacted in a single suspension-type exchanger with exhaust gases formed by reaction of the oxygen-containing gases in the f... | 12/08/1981 |
| 4299634 | Process for the preparation of raw mix for the production of cement and sulphuric acid Preparation of a raw mix for use in the production of cement and sulphuric acid by the cement-sulphuric acid process, wherein coke is comminuted to a degree that at most 10% by weight of the coke has a particle size of less than 0.1 mm and at least 90% by... | 11/10/1981 |
| 4102989 | Simultaneous reductive and oxidative decomposition of calcium sulfate in the same fluidized bed Calcium sulfate is decomposed to CaO and SO2 by high temperature treatment in a fluidized bed wherein reductive and oxidative conditions are simultaneously maintained. A highly reducing gas is formed in the lower portion of the bed from partial... | 07/25/1978 |
| 4083693 | Apparatus for treating waste acids A system for regenerating waste acid, comprises (1) a concentrator for concentrating the waste liquor, (2) a reactor for reacting the concentrated liquor at a temperature below 1000° F. in the presence of oxygen and hydrocarbon combustion gases and on a ... | 04/11/1978 |
| 4081442 | Process for the recovery of &3xb5;-caprolactam from a reaction mixture of &3xb5;-caprolactam and sulphuric acid A process for removing sulfuric acid from reaction mixtures containing sulfuric acid and &3xb5;-caprolactam by treating the sulfuric acid with ammonia and sulfur dioxide to produce ammonium sulfate salts and reducing the ammonium sulfate salts to ammonia ... | 03/28/1978 |
| 4040853 | Process for the preparation of raw mix for the production of cement and sulphuric acid A process for the preparation of raw mix for the production of cement and sulphuric acid by the cement-sulphuric acid process, which mix comprises calcium sulphate, coke and other additives, by separate grinding of the materials used, which comprises grin... | 08/09/1977 |
| 4008169 | Preparation of iron oxide sorbent for sulfur oxides A highly sorbent iron oxide for use in the purification of dilute sulfur and oxygen-bearing gases is prepared by a two step process which involves a low temperature decomposition of iron sulfate and a low temperature oxidation of the intermediate product.... | 02/15/1977 |
| 3995012 | Process of producing hydrogen and oxygen from H2 O in a thermochemical cycle A method of producing hydrogen and oxygen by splitting water in a thermocical cycle, according to which in a first method stage a gas mixture of from 1 to 50 parts by volume of steam and 2 parts by volume of sulfur dioxide is reacted at a temperature wit... | 11/30/1976 |
