Bizarre Patents
System for magnetically attaching templeless eyewear to a person
A system of eyewear that eliminates the need for hinges on the frames of the eyewear.
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 |
| 8183389 | Process for the treatment of an aqueous mixture comprising a dipolar aprotic compound The invention relates to a process for the treatment of an aqueous mixture comprising a dipolar aprotic compound, comprising: a) an adsorption step, in which the aqueous mixture is brought into contact with a porous adsorbent, whereby the porous adsorbent is chosen ... | 05/22/2012 |
| 7947845 | Process for purifying removal of acrylic acid, methacrylic acid N-vinylpyrrolidone or P-xylene crystals from their suspension in mother liquor A process for purifying removal of acrylic acid, methacrylic acid, N-vinylpyrrolidone or p-xylene crystals from their suspension in mother liquor by means of a wash column with forced transport, whose shell of the process chamber is a metal wall, the wash column add... | 05/24/2011 |
| 7732624 | Process for operating a continuous removal of a target product X in the form of fine crystals A process for continuously removing a target product X in the form of fine crystals from a liquid phase P comprising the target product X and constituents other than the target product X by cooling suspension crystallization in an indirect heat transferer, in which ... | 06/08/2010 |
| 7153978 | Method for purifying N-methyl-2-pyrrolidone A method for purifying N-methyl-2-pyrrolidone is disclosed. The method comprises treating N-methyl-2-pyrrolidone with an alumina that desorbs less than 100 μmol/g of isobutylene between 225° C. and 400° C. in a standard tert-butyl alcohol dehydration test. The me... | 12/26/2006 |
| 7138528 | Method for crystallizing N-vinyl-2-pyrrolidone A method for purifying N-vinyl-2-pyrrolidone (NVP) is disclosed. The method comprises crystallizing NVP in the presence of added water to produce purified NVP crystals and a mother liquor, and then isolating the purified crystals. In a preferred method, 0.5 to 4 wt.... | 11/21/2006 |
| 7129376 | Method for the production of a purified melt of at least one monomer The invention relates to a method for the production of a purified melt of a monomer melt obtained by condensation, absorption or extraction in a crystallizer, wherein the inlet to the crystallizer is subjected to a mechanical solid/liquid separation operation. ... | 10/31/2006 |
| 7037412 | Method for preparing deodorized N-vinyl-2-pyrrolidone The invention provides a method for producing purified N-vinyl-2-pyrrolidone free of odorous components. The method is composed of distilling with a distillation column a liquid, which is formed by adding to an odorous components-containing liquid having a N-vinyl-2... | 05/02/2006 |
| 6888006 | Method for processing pyrollidone and n-vinyl pyrollidone residues A process for working up residues from the preparation of pyrrolidone and/or N-vinylpyrrolidone comprises subjecting the residues to a thermolysis. ... | 05/03/2005 |
| 6726811 | Method of purifying N-(2-hydroxyethy)-2-pyrrolidone A method for obtaining high purity N-(2-hydroxyethyl)-2-pyrrolidone satisfactory for use as an intermediate material for N-vinyl-2-pyrrolidone from a reaction liquid formed of a reaction between y-butyrolactone and 2-aminoethanol, i.e., a liquid containing N-(2-hydr... | 04/27/2004 |
| 6703511 | Method for obtaining pure n-vinyl pyrrolidone The invention describes a process for the isolation of pure N-vinylpyrrolidone from N-vinylpyrrolidone-containing crude products, comprising a single-stage or multistage crystallization process, which comprises passing the mother liquor from the first cry... | 03/09/2004 |
| 6521097 | Process for separating hydrogen chloride from a mixture comprising an N-alkyl-2-pyrrolidone and hydrogen chloride A process for separating hydrogen chloride from a mixture including an N-(C1 -C18)-alkyl-2-pyrrolidone and hydrogen chloride by distilling the mixture including an N-(C1 -C18)-alkyl-2-pyrrolidone and hydrogen ch... | 02/18/2003 |
| 6486169 | Botanical drug for treatment and prevention of alzhimer's disease The present invention related to safe botanical drug for treatment and prevention of Alzheimer's disease. Specifically, this invention proves a safe botanical drug, Huperzine (HUE) and Clausenamide (CLE) and their preparation. HUE has the following pharma... | 11/26/2002 |
| 6436243 | Process for recovering N-vinyl-2-pyrrolidone A process for recovering N-vinyl-2-pyrrolidone is provided which allows to recover N-vinyl-2-pyrrolidone efficiently and steadily and in high purity by continuous distillation from a mixed liquid containing N-vinyl-2-pyrrolidone, N-(2-hydroxyethyl)-2-pyrr... | 08/20/2002 |
| 6417356 | Stabilization of vinylether and vinyl lactam formulations against hydrolysis This invention relates to a composition containing (a) a component selected from the group of a mono- or poly- vinyl substituted mono- or poly-ether, a mono- or poly- vinyl substituted lactam, or a mixture thereof contained in an acidic medium and (b) an ... | 07/09/2002 |
| 6207824 | Purification of N-substituted lactams A process for reducing the amine content of amine-contaminated N-substituted lactams comprises treating the contaminated N-substituted lactams with an acid macroporous cation exchanger.... | 03/27/2001 |
| 6051720 | Removal of contaminants from N-methyl-2-pyrrolidone A process is provided for moving at least one contaminant selected from the group consisting of phenol thiophenol, and phenyl disulfide from contaminated NMP by reacting at least one monohalogenated aromatic compound and a base with the contaminate NMP.... | 04/18/2000 |
| 5945544 | Process for production of N-vinyllactam A process for producing an N-vinyllactam by reacting a lactam with acetylene in the presence of a particular catalyst (an alkali metal alcoholate between an alicyclic alcohol and an alkali metal) in a nonaqueous system at an acetylene partial pressure of ... | 08/31/1999 |
| 5777131 | Post manufacture process for improving the properties of lactones and substituted lactams This invention relates to a method for improving the properties of lactones and substituted lactams by subjecting the post-manufactured lactones and substituted lactams to an ion exchange resin. Specifically, this invention relates to a method for reducin... | 07/07/1998 |
| 5710284 | Purification of N-vinylpyrrolidone by crystallization In a process for purifying N-vinylpyrrolidone by crystallization in a crystallizer, those surfaces of the crystallizer from which crystals grow during the crystallization are covered with an N-vinylpyrrolidone seed layer before the crystallization.... | 01/20/1998 |
| 5462643 | Method for reprocessing solvent mixtures containing constituents of low volatility and apparatus suitable therefor Reprocessing mixtures which contain organic solvents and constituents of low volatility and may contain water: includes introducing the mixture into a concentration apparatus of a solvent recovery system, concentrating the mixture in the concentration app... | 10/31/1995 |
| 5461159 | Binding chemical impurities contained in crude N-vinylpyrrolid-2-one Chemical impurities contained in N-vinylpyrrolid-2-one are bound by a process in which the anhydride of an organic carboxylic acid is added to the crude N-vinylpyrrolid-2-one.... | 10/24/1995 |
| 5183538 | Extraction plus ion exchange processing of a brine stream A method for recovering a liquid diluent having a low salt content from an organic/aqueous mixture which contains significant quantities of the diluent, an alkali metal salt, and water comprises an integrated process which joins extraction and ion exchang... | 02/02/1993 |
| 5167775 | Method for recovery of solvent used in production of polyarylene sulfide The present invention provides a method for the recover of a solvent used in the production of a polyarylene sulfide according to which the deterioration of the solvent is low and the recovery rate is high, wherein a mixed liquid, mainly composed of the s... | 12/01/1992 |
| 5068358 | Process for extracting N-methyl-2-pyrrolidone The invention relates to a process for separating N-methyl-2-pyrrolidone (NMP) from aqueous solutions which are obtained in industry, inter alia, in the production of heat-resistance polymers such as polyamides and polyimides. According to the invention, ... | 11/26/1991 |
| 5039817 | Preparation of pure N-vinyl-2-pyrrolidone Pure N-vinyl-2-pyrrolidone is prepared by treating the crude N-vinyl-2-pyrrolidone with an acid ion exchanger.... | 08/13/1991 |
| 4976825 | Process for recovering N-methylpyrrolidone by plural distillations A process for recovering N-methylpyrrolidone contained in an N-methylpyrrolidone-containing liquid formed in the process for preparing a polyarylene thioether by the dehalogenosulfidation of a dihalogeno-aromatic compound and an alkali metal sulfide in th... | 12/11/1990 |
| 4965370 | N-methyl-2-pyrrolidone purification A process for recovering N-methyl-2-pyrrolidone from an effluent stream in a poly(arylene sulfide) process containing N-methyl-2-pyrrolidone contaminated with acidic compounds and high boiling contaminants by contacting the kettle liquid from a heavies fr... | 10/23/1990 |
| 4895959 | Purification of N-methyl-2-pyrrolidone A method for purifying N-methyl-2-pyrrolidone containing thiophenol and/or diphenyl disulfide is disclosed, comprising adding a polyhalogenated aromatic compound and an alkali metal hydroxide and/or an alkali metal carbonate to the N-methyl-2-pyrrolidone ... | 01/23/1990 |
| 4859781 | Recovery of N-methyl-2-pyrrolidone In a process for recovery N-methyl-2-pyrrolidone from a liquid aqueous medium (preferably a brine) by liquid-liquid extraction, the improvement comprises using a branched aliphatic C5-C7 alcohol as extractant. In a particular embodiment, the liquid aqueou... | 08/22/1989 |
| 4837338 | Removal of impurities from n-methyl-pyrrolidone using highly pure water washed activated alumina N-methyl pyrrolidone solvent (hereinafter NMP) used to extract aromatic components from lubricating oil distillates is purified by contacting the solvent with activated alumina.... | 06/06/1989 |
| 4831160 | Removal of volatile acids from NMP solvent vapors with sacrificial metal and ion exchange Volatile acids present in n-methyl pyrrolidone vapor from solvent extraction processes can be reacted with sacrificial metals such as magnesium to concentrate the acid salts into a small volume of oil/NMP. Steam stripping removes NMP from the oil/NMP mixt... | 05/16/1989 |
| 4610768 | Lactam purification A process for drying lactams to extremely low water contents is provided which comprises mixing the lactam with hydrocarbon distilling from the mixture a water/hydrocarbon vapor and or condensate, contacting said vapor or condensate with a drying agent to... | 09/09/1986 |
| 4552970 | Solvated salts of dinitrophenylcyanamides, and a process for the preparation thereof Compounds of the formula I ##STR1## in which X denotes hydrogen, fluorine, chlorine or bromine, Y and Z denote hydrogen, lower alkyl or lower alkoxy, M denotes sodium, potassium or one equivalent of calcium and L denotes a dipolar aprotic solvent, ar... | 11/12/1985 |
| 4510316 | Purification of N-methylpyrrolidone Phenol is extracted with a chlorinated aromatic extractant, such as p-dichlorobenzene, from an aqueous mixture containing phenol and N-methylpyrrolidone. In an embodiment of this invention the purified N-methylpyrrolidone is recycled for use in a poly(phe... | 04/09/1985 |
| 4501902 | N-Methyl pyrrolidone-2 purification A process for removing compounds from aprotic solvents in which aprotic solvent containing at least one acidic compound is contacted with a solid inorganic compound chosen from alkaline earth carbonates, alkaline earth hydroxides, alkaline earth oxides, a... | 02/26/1985 |
| 4472585 | Extraction of N-methylpyrrolidone-2 Water or acidified water can be used to extract N-methylpyrrolidone from a mixture containing phenol and N-methylpyrrolidone. In one embodiment of this invention water or acidified water can be used to extract N-methylpyrrolidone from the kettle bottoms o... | 09/18/1984 |
| 4400521 | N-Substituted phenyl maleimides Maleimide compounds represented by the general formula (I) ##STR1## where R and R' are a hydrogen atom, a halogen atom, or an alkyl radical of from 1 to 4 carbon atoms, and n and n' are a whole number of from 1 to 4; and a process for the preparation... | 08/23/1983 |
| 4384125 | Process for the purification of 2-pyrrolidone In a distillation process 2-pyrrolidones obtained from succinonitrile are purified by treating the impure liquid pyrrolidone with a strong base, fractionally distilling this product to yield, as distillate, polymerization grade purified 2-pyrrolidone, mix... | 05/17/1983 |
| 4316846 | Recovery of aprotic amides The present invention relates to the recovery of three aprotic amide solvents from their water solutions by extraction with a selected class of organic solvents characterized generally by having two electron withdrawing substituents, exemplified by fluori... | 02/23/1982 |
| 4276215 | Purification of pyrrolidone 2-Pyrrolidone is purified by contact with particulate calcium oxide for a sufficient time at elevated temperatures followed by distilling and condensing the purified 2-pyrrolidone.... | 06/30/1981 |
