Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 7608740 | Method of synthesizing key intermediates for the production of camptothecin derivatives The present invention discloses a process for efficient production of 2-amino-5-hydroxypropiophenone corresponding to the AB ring part of camptothecin (CPT) skeleton, which is a key intermediate useful for the total synthesis of camptothecin analogs including 7-Ethy... | 10/27/2009 |
| 7378555 | Method of synthesizing camptothecin-relating compounds The present invention is to prepare efficiently 2′-amino-5′-hydroxypropiophenone corresponding to the AB-ring part of camptothecin (CPT) skeleton and a tricyclic ketone corresponding to the CDE-ring part in order to provide efficiently CPT by the total synthesis... | 05/27/2008 |
| 7364667 | Slurry for CMP and CMP method A CMP slurry comprising polishing abrasives containing mixture abrasives of silica and alumina is used. In CMP using the slurry comprising mixture abrasives of silica and alumina as polishing abrasives, a down force-dependency of a polishing rate is high and an incr... | 04/29/2008 |
| 7282610 | Method of producing aromatic amine compound having alkylthio group A method of producing an aromatic amine compound, that includes reducing an aromatic nitro compound that has an aromatic ring having an alkylthio group as a substituent, to obtain a corresponding aromatic amine compound, wherein the aromatic nitro compound is reduce... | 10/16/2007 |
| 7233647 | Radiation window and method of manufacture A radiation window device to transmit radiation as part of an x-ray source or detector includes a support to be subject to a substantial vacuum, and an opening configured to transmit radiation. A film is mounted directly on the support across the opening, and has a ... | 06/19/2007 |
| 7193112 | Process for the production of aromatic amines by heterogeneously catalysed hydrogenation The invention describes a process for the production of aromatic amines by the catalytic hydrogenation of aromatic nitro compounds, with the process being characterized by at least one catalytic hydrogenation step and the catalyst consists at least of a monolithic s... | 03/20/2007 |
| 7109378 | Monolith catalytic reactor coupled to static mixer The invention pertains to an improved apparatus comprised of a monolith catalytic reactor having an inlet and an outlet and a static mixer having an inlet and an outlet thereto with the outlet of said static mixer in communication with the inlet of said monolith cat... | 09/19/2006 |
| 7064237 | Method for the production of amines Amines are prepared by hydrogenation of the corresponding nitroaromatics in a vertical reactor whose length is greater than its diameter and which has in its upper region a downward-directed jet nozzle via which the reaction mixture and, if desired, part of the star... | 06/20/2006 |
| 7035379 | Radiation window and method of manufacture A radiation window device to transmit radiation as part of an x-ray source or detector includes a support to be subject to a substantial vacuum, and an opening configured to transmit radiation. A film is mounted directly on the support across the opening, and has a ... | 04/25/2006 |
| 7015304 | Solvent free low-melt viscosity imide oligomers and thermosetting polyimide composites This invention relates to the composition and a solvent-free process for preparing novel imide oligomers and polymers specifically formulated with effective amounts of a dianhydride such as 2,3,3′,4-biphenyltetra carboxylic dianydride (a-BPDA), at least one aromat... | 03/21/2006 |
| 6894193 | Method for hydrogenating liquid organic compounds Liquid organic compounds are hydrogenated by a process in which the hydrogen present in the reactor contains proportions of at least one gas which is inert in the hydrogenation reaction. ... | 05/17/2005 |
| 6838581 | Process for the preparation of enantiomerically pure 3-phenyl-3-hydroxypropylamine The present invention relates to an improved process for the synthesis of enantiomerically pure 3-phenyl-3-hydroxypropylamine of formula I; more particularly the present invention relates to the said process using styrene; | 01/04/2005 |
| 6759555 | Process for the preparation of combretastatins The present invention provides novel processes for the preparation of combretastatins or stilbene compounds of formulae (I) and (III) wherein A is NH2 or and PG is... | 07/06/2004 |
| 6657085 | Process for the preparation of aniline compounds A process for the preparation of aniline compounds of formula: ##STR1## wherein n and R are as defined in claim 1, by reacting nitro compounds of formula: ##STR2## wherein n and R are as defined, with hydrazine at elevated temperature in the prese... | 12/02/2003 |
| 6441235 | Preparation of 5-amino-isophthalamides A process for preparing 5-amino-N,N'-bis(R)isophthalamides, where A is 2,3-dihydroxypropyl or 1,3-dihydroxyisopropyl, useful as intermediates in preparing iodinated diagnostic agents, which comprises reacting a di-lower-alkyl 5-nitroisophthalate with a co... | 08/27/2002 |
| 6403833 | Single step hydrogenation of nitrobenzene to p-aminophenol The present invention provides a single step process for the preparation of p-aminophenol by hydrogenation of nitrobenzene in presence of an aqueous acid over a mono or bimetallic nickel catalyst at a temperature in the range of 80-120° C. for a period o... | 06/11/2002 |
| 6350911 | Method for producing amines The invention relates to a process for the preparation of amines by hydrogenation of nitro compounds, which comprises carrying out the hydrogenation in a vertical reactor whose length is greater than its diameter, having a downward-facing jet nozzle arran... | 02/26/2002 |
| 6342079 | Primary intermediate for use in oxidative hair dyeing 1-(2,5-Diaminophenyl)ethanol useful as a primary intermediate for the oxidative dyeing of hair.... | 01/29/2002 |
| 6278022 | Process for the preparation of insecticidal phenylhydrazine derivatives Disclosed herein is an improvement in a method for making compounds having the structural formulae (I) or (II): ##STR1## wherein: X is a) phenyl; lower phenylalkoxy; phenoxy; or benzyl; or b) one substituent from group a) and one or more substituents sele... | 08/21/2001 |
| 6268536 | Conversion of ammonium picrate to various useful chemical products A process for the conversion of a picrate salt, preferably ammonium pricrate, to picric acid by acidifying the picrate salt in a two phase liquid system. One phase is an aqueous phase which contains an acid which is effective for acidifying ammonium picra... | 07/31/2001 |
| 6258982 | Process for the preparation of substituted aromatic amino compounds The present invention relates to a hydrogenation process for the preparation of aromatic amino compounds containing directly on the aryl ring or in a side chain one or more entities that may also undergo hydrogenation, such as carbon multiple bonds, nitri... | 07/10/2001 |
| 6228130 | Primary intermediate in oxidative hair dyeing 5-Nitroisatin is reacted with sodium hydroxide to produce an -keto acid sodium salt that is reduced with borane-tetrahydrofuran complex and then hydrogenated to produce 1-(2,5-diaminophenyl)ethylene glycol, a novel compound useful as a primary inte... | 05/08/2001 |
| 6204413 | Process for the preparation of salts of 1-substituted 2,4-diaminobenzenes The invention relates to a process for the preparation of specific salts of 1-substituted 2,4-diaminobenzenes by catalytic hydrogenation of 1-substituted 2,4-dinitrobenzenes and addition of the reaction product obtained after the hydrogenation and separat... | 03/20/2001 |
| 6096924 | Process for the catalytic hydrogeneration of aromatic nitro compounds One object of the invention is a process for the catalytic hydrogenation of aromatic nitro compounds in solution or in melt in the presence of hydrogen and at least one noble metal catalyst, nickel catalyst or cobalt catalyst, in which process a catalytic... | 08/01/2000 |
| 6093852 | Process for preparing 4,6-diamino-resorcinol dihydrochloride The invention concerns 4,6-diamino-resorcinol which is prepared in the form of its dihydrochloride by catalytic hydrogenation of 1,3-benzyloxy-4,6-dinitrobenzene on a noble metal contact in a two-phase mixture of dilute aqueous hydrochloric acid and an or... | 07/25/2000 |
| 6069278 | Aromatic diamines and polyimides based on 4,4'-bis-(4-aminophenoxy)-2,2' or 2,2',6,6'-substituted biphenyl This invention relates the novel diamines, the polyimide oligomers and the polyimides derived therefrom and to the method of preparing the diamines, oligomers and the polyimides. The thermoplastic polyimides derived from the aromatic diamines of this inve... | 05/30/2000 |
| 6028227 | Single step process for the preparation of p-aminophenol The present invention provides a single step process for the preparation of p-aminophenol by contacting a mixture of nitrobenzene and water with hydrogen over a solid acid catalyst, terminating the reaction to obtain a reaction mixture containing the prod... | 02/22/2000 |
| 5980584 | Substituted p-aminophenol, process of preparation and use in dyeing hair The novel primary intermediate, 1-(5-amino-2-hydroxyphenyl)ethane-1,2-diol and a method for producing same, are disclosed. The novel intermediate can be employed as a replacement for p-aminophenol in oxidation dye formulations.... | 11/09/1999 |
| 5977413 | Method for producing bis(3-amino-4-hydroxyphenyl) compounds Disclosed is a method for producing bis(3-amino-4-hydroxyphenyl) compounds, which comprises reducing bis(3-nitro-4-hydroxyphenyl) compounds with hydrazines in the presence of a catalyst. The method produces bis(3-amino-4-hydroxyphenyl) compounds of high q... | 11/02/1999 |
| 5911908 | Method of stabilizing 4,6-diaminoresorcinol and salt thereof A method for stabilizing DAR during storage, comprising storing DAR in the presence of a reducing agent having a standard redox potential of not less than -0.20 volt and not more than 0.34 volt, in a proportion of not less than 100 ppm and not more than 1... | 06/15/1999 |
| 5900509 | Process for the preparation of p-haloalkoxyanilines p-Haloalkoxyanilines are obtained from the corresponding nitrobenzenes by catalytic hydroxylation in the presence of an aqueous acidic reaction medium with the formation of a corresponding aminophenol and reaction of this aminophenol with a halogenated ol... | 05/04/1999 |
| 5861533 | Process for nitrosation of C-H-acidic compounds A process for nitrosating C-H-acidic compounds. The process substantially avoids producing polluted wastewater.... | 01/19/1999 |
| 5744643 | Process for preparing aromatic amines The present invention relates to a process for preparing aromatic amines by reacting an aromatic nitro compound with carbon monoxide in a solvent mixture comprising water and a water-insoluble organic solvent by means of a catalyst comprising palladium an... | 04/28/1998 |
| 5679859 | Process for producing improved crystals of 3-amino-2-hydroxyacetophenone salt The present invention concerns a process for producing crystals of 3-amino-2-hydroxyacetophenone salt having a high bulk density and improved flow properties, by treating 3-amino-2-hydroxyacetophenone of formula (1) ##STR1## or hydrogen halide salt t... | 10/21/1997 |
| 5631405 | Method of forming amino acid-derived diaminopropanols useful as chemical intermediates for protease-inhibitors The present invention relates to a method of forming a 1,3-diamino-3-substituted-2-propanol chemical intermediate from which various chemicals, such as selected protease-inhibitors and other drugs, as well as polymers, can be synthesized. This method incl... | 05/20/1997 |
| 5618966 | Method forming protease inhibitor synthetic intermediates The present invention relates to a method of forming a 1,3-diamino-3-substituted-2-propanol chemical intermediate from which various chemicals, such as selected protease-inhibitors and other drugs, as well as polymers, can be synthesized. This method incl... | 04/08/1997 |
| 5599994 | Amino acid-derived diaminopropanols The present invention relates to a method of forming a 1,3-diamino-3-substituted-2-propanol chemical intermediate from which various chemicals, such as selected protease-inhibitors and other drugs, as well as polymers, can be synthesized. The method inclu... | 02/04/1997 |
| 5574188 | Process for the preparation of 4,6-diaminoresorcinol 4,6-diaminoresorcinol can be prepared in a plurality of steps in such a way that a) 1,3-dichlorobenzene is nitrated with a mixed acid of HNO3, H2 SO4 and SO3 at 0 to 40° C. in anhydrous H2 SO4,... | 11/12/1996 |
| 5545754 | Process for the preparation of p-amino-phenols p-Amino-phenols are advantageously prepared by catalytic hydrogenation of the aromatic nitro compounds on which they are based in a reaction medium of aqueous sulphuric acid in the sense of a Bamberger rearrangement at elevated temperature by a procedure ... | 08/13/1996 |
| 5484953 | O-phenylenediamines containing fluoroalkyl(ene) groups Novel o-phenylenediamines of the formula containing fluoroalkyl(ene) groups ##STR1## in which the symbols used have the meaning given in the description, processes for their preparation and their use as intermediates.... | 01/16/1996 |
