Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7208625 | Removing permanganate-reducing impurities from acetic acid A method for removing permanganate-reducing impurities from an acetic acid product is disclosed. The method comprises contacting an acetic acid product containing permanganate-reducing impurities with peracetic acid and an oxygen-containing gas. The method is partic... | 04/24/2007 |
| 7022844 | Amide-based compounds, production, recovery, purification and uses thereof Methods are disclosed of producing and purifying at least one amide. In accordance with one of the methods disclosed herein, the at least one amide is produced by providing an organic liquid comprising at least one oxime, providing at least one catalyst, adding the ... | 04/04/2006 |
| 6987201 | Acetic anhydride, method of purifying crude acetic anhydride, and method of producing polyoxytetramethylene glycol using acetic anhydride The present invention provides acetic anhydride, a method of purifying crude acetic anhydride, and a method of producing polyoxytetramethylene glycol using acetic anhydride. A method of producing polyoxytetramethylene glycol by ring-opening-polymerizing tetra... | 01/17/2006 |
| 6926869 | Apparatus for carbamate decomposition and ammonia and carbon dioxide stripping from urea solutions capable of 180 degree inversion about a horizontal axis An apparatus (1) for carbamate decomposition and ammonia and carbon dioxide stripping from urea solutions, wherein a stripper (2) including a substantially cylindrical shell (3), which can be fitted onto a structure (6) for supporting the... | 08/09/2005 |
| 6365413 | Thin film thermal oxidative oil deposit testing device and method Thin film thermal oxidative engine oil or other oleaginous liquid deposit device has an oleaginous test liquid placement volume; a heatable depositor surface in liquid communication with the volume; a supply for at least one of an oxidant and another subs... | 04/02/2002 |
| 6274767 | Process for the revamping of urea synthesis plants consisting of a stripper with ammonia Process for the revamping of urea production plants for the synthesis of ammonia (NH3) and carbon dioxide, with a stripping section with NH3, in which the process carries out with differentiated yields, a majority reaction a) between highly pure reagents ... | 08/14/2001 |
| 6197162 | Liquid purifying distillation process A method of remediating water contaminated by dissolved gases and liquids and suspended particles wherein the contaminated water is collected into a closed container without filling the container and heated to a temperature below the boiling point of wate... | 03/06/2001 |
| 6100427 | Production of amides and/or acids from nitriles A process for producing an amide and/or acid from a nitrile comprises introducing a nitrile, as a first reactant, and a hydration compound, as a second reactant which is capable of reacting with the nitrile to convert it to its corresponding amide thus hy... | 08/08/2000 |
| 5792889 | Process for urea production involving a carbon dioxide stripping step An improved process for urea production as well as a method of retrofitting a pre-existing urea plant based on the Stamicarbon process are disclosed. According to the invention, a high-yield reactor with partial removal of the reaction heat and a urea rec... | 08/11/1998 |
| 5700358 | Recovery of caprolactam from oligomers and/or polymers of caprolactam Caprolactam is recovered from oligomers and/or polymers of caprolactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam obtained in the cleavage, by a process including (a) cleaving oligo... | 12/23/1997 |
| 5681537 | Plant for urea production involving a carbon dioxide stripping step An improved process for urea production as well as a method of retrofitting a pre-existing urea plant based on the Stamicarbon process are disclosed. According to the invention, a high-yield reactor with partial removal of the reaction heat and a urea rec... | 10/28/1997 |
| 5606094 | Acrolein scavengers Disclosed herein is a process for removing acrolein from a gaseous or liquid mixture, in one case aqueous solutions, involving contacting the mixture with a compound selected from the group consisting of sodium hypochlorite; an acid salt of hydroxylamine;... | 02/25/1997 |
| 5468350 | Apparatus for manufacturing ultrapure water The apparatus includes a container for accommodating water to be treated and evaporating the water. Container is attached with water supply for supplying the water to be treated into the container. The water to be treated in container is heated by a heate... | 11/21/1995 |
| 5451300 | Process for stripping a volatile component from a liquid A process and apparatus for stripping a volatile component from a liquid. The volatile component is destroyed by exothermic reaction with an active component in the gas phase, typically over a catalyst. Heat generated by the reaction of the volatile and a... | 09/19/1995 |
| 5397439 | Method for recovering 1,4-butanediol A method for recovering 1,4-butanediol from a hydrolysate obtained by hydrolyzing diacetoxybutane, by (1) supplying the hydrolysate to a first distillation column, distilling off substantially all the amounts of water and acetic acid as the top stream fro... | 03/14/1995 |
| 5362365 | Purification of acetic anhydride or acetic anhydride and acetic acid using ozone Acetic acid and/or acetic anhydride containing methyl crotonate, vinyl acetate, or both as impurities, is contacted with ozone in an amount of excess molar to the carbon-carbon double bond in said methyl crotonate and/or vinyl acetate and the impurities p... | 11/08/1994 |
| 5176800 | Process for the modernization of existing urea plants and a modernized urea plant A process to modernize existing urea plants which use a stripping with carbon dioxide, and to increase urea yields and flexibility under overload conditions while at the same time reducing energy consumption, corrosion phenomena and possible risks of expl... | 01/05/1993 |
| 5037510 | Integrated water distiller and/or water heater and/or furnace An integrated system provides combined space heating, water heating and water distillation. The system is adapted for supplying combined services to residential and commercial buildings. The system may be used in retrofitting existing space heating furnac... | 08/06/1991 |
| 4978518 | Continuous vacuum process for recovering vromine A continuous process for the extraction of bromine from a bromide-rich brine in high efficiency while dramatically reducing the steam requirement for the distillation by operating a contact tower under vacuum. The contact tower is designed to operate near... | 12/18/1990 |
| 4954330 | Process for purifying hydrogen fluoride A process for preparing hydrogen fluoride involving treating anhydrous hydrogen fluoride containing primarily trivalent arsenic impurities with an effective amount of chromium (VI) oxide (i.e., CrO3) and oxygen such as to oxidize substantially ... | 09/04/1990 |
| 4929435 | Manufacture of high purity low arsenic anhydrous hydrogen fluoride A process for manufacturing high purity anhydrous hydrogen fluoride (HF) having low levels of arsenic impurity by contacting anhydrous hydrogen fluoride product, or an intermediate product obtained during the manufacture of HF, with hydrogen peroxide to o... | 05/29/1990 |
| 4735728 | Method for pollution control in photographic processing A combination of pollution control technologies are employed in the treatment of effluent from photographic processing. The technologies employed are evaporation, oxidation by photolysis and catalyzed ozone, condensation, treatment by activated carbon and... | 04/05/1988 |
| 4725425 | Continuous vacuum process for recovering bromine A continuous process for the extraction of bromine from a bromine-rich brine in high efficiency while dramatically reducing the steam requirement for the distillation by operating a contact tower under vacuum. The contact tower is designed to operate near... | 02/16/1988 |
| 4719096 | Continuous two-stage vacuum process for recovering bromine A highly efficient continuous process for the winning of bromine from a bromide-containing brine which increases overall bromine recovery efficiency, decreases chlorine requirements, decreases waste-brine neutralization, improves steam recovery, increases... | 01/12/1988 |
| 4714525 | Process for separating high purity water A process for purifying impure water, e.g. heavy water, which provides for the removal of dissolved inorganic and organic contaminants by distillation of the water and washed vapor withdrawal, and optional chemical pretreatment of oxidazable matter.... | 12/22/1987 |
| 4640769 | Apparatus for photographic film processor pollution control The apparatus uses a combination of technologies for treatment of hazardous and nonhazardous liquid wastes. The first treatment step is an evaporation stage where the liquid wastes are heated. The resulting steam and vapors are then oxidized by photolysis... | 02/03/1987 |
| 4379026 | Process for the purification of benzaldehyde A process for the purification in the presence of water of impure benzaldehyde by which a purified benzaldehyde is prepared which has improved color stability and improved olfactory characteristics. The process is comprised of the steps of treating the im... | 04/05/1983 |
| 4379024 | Process for the manufacture of alkylaminoalkanol Color-stable alkylaminoalkanol is prepared by adding, prior to stripping-off excess reactant, an alkali metal borohydride to the reaction product of alkylene oxide and an excess of primary or secondary amine and thereafter distilling the reaction mass to ... | 04/05/1983 |
| 4339309 | Method for removing fluoride contamination from nitric acid Fluoride ions are removed from nitric acid solution by contacting the vaporized solution with alumina or zirconium.... | 07/13/1982 |
| 4316774 | Thermoelectric integrated membrane evaporation system A urine-water recovery system is described which provides efficient potable water recovery from waste liquids. The design allows use over extended durations such as encountered in space flights. The system has advantages such as low power consumption, com... | 02/23/1982 |
| 4257851 | Purification of naphthoquinone A crude naphthoquinone produced by an oxidation of naphthalene is purified by a reduced pressure distillation of a crude 1,4-naphthoquinone having an acid content of less than 5 equivalent % calculated as monobasic acid and the crude naphthoquinone is pre... | 03/24/1981 |
| 4167525 | Process for preparation of aromatic acyl chloride An aromatic acyl chloride is obtained with industrial advantages by reacting an aromatic carboxylic acid, phosphorus trichloride and chlorine, treating the reaction mixture comprising by-produced phosphorus pentachloride with at least one treating agent s... | 09/11/1979 |
| 4073660 | Recovery of chemical components of cellulosic regenerating solution Recovery of the chemical components of a cellulosic organic solvent regenerating solution containing a dialkylacylamide, water, nitrous and nitric acid. The process comprises neutralizing the solution to form the metal salts of nitrous and nitric acid, di... | 02/14/1978 |
| 4067779 | Process for the purification of 1,10-decanedicarboxylic acid Crude 1,10-decanedicarboxylic acid produced by the nitric acid oxidation at 20°14 60° C. of cyclododecanone, cyclododecanol or a mixture thereof can be purified by distillation to a purity suitable for use in the production of polyamides and polyesters ... | 01/10/1978 |
| 4061546 | Purification of acetic acid Formic acid is removed from acetic acid substantially free of halide impurities but containing small amounts of formic acid by contacting the acid with a compound of hexavalent chromium and recovering the purified acid from the resulting mixture by distil... | 12/06/1977 |
| 4060460 | Removal of chloroprenes from ethylene dichloride Process is provided for removal of chloroprenes as impurities from ethylene dichloride streams formed in the production of vinyl chloride by the thermal cracking of ethylene dichloride. The ethylene dichloride stream is subjected to distillation in a dist... | 11/29/1977 |
