Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7772376 | Manufacturing process A process for the preparation of a desired chemical compound in a continuous reactor in which a part of the product stream exits the reactor and part of the product stream is recycled around the reactor in order to reduce the amount of buffer that would otherwise be... | 08/10/2010 |
| 7521545 | Azo compounds and process for production thereof A process for the production of an aromatic azo compound having a 2,3-dihydrobenzofuran ring bearing a diazo group at the 5-position of the ring by conducting the diazo coupling of a 2,3-dihydrobenzofuran derivative represented by the general formula (II): | 04/21/2009 |
| 7439339 | Azo coupling reactions of hydrophobic compounds A process for forming a diazo compound comprises reacting an organic compound bearing an acidic hydrogen with an aryl-diazonium salt in the presence of an inorganic base and a non-halogenated solvent. The process is simpler and more environmentally friendly than kno... | 10/21/2008 |
| 7402369 | Mono azo iron complex compound, and charge controlling agent and toner using the same The present invention is to provide a charge controlling agent and negatively chargeable toner that do not contain any toxic metal, are essentially free from the risk of evoking ignition or explosion, and can exhibit a high charge amount and rapid initial increase i... | 07/22/2008 |
| 7361441 | Color toner, and full-color image-forming method A yellow toner in which, in a spectral-distribution diagram in which the reflectance (%) is plotted as ordinate and the wavelength (nm) as abscissa, the reflectance determined for a toner in a state of powder ranges from 15% to 20% at a wavelength of 500 nm and rang... | 04/22/2008 |
| 7160371 | Method of improving pigment fluorescence A process for the preparation of organic pigments with enhanced fluorescence, which process comprises treating said pigments with a surfactant, and to the fluorescent organic pigments obtained by said process. The pigments according to the present invention can be u... | 01/09/2007 |
| 7115164 | Preparation of yellow pigments A process for the manufacture of a transparent Pigment Yellow 155 or transparent Pigment Yellow 180 is disclosed, said process includes grinding particles of said pigment in the presence of a grinding agent until said particles achieve a surface area of at least abo... | 10/03/2006 |
| 7081160 | Azobarbituric acid metal complex pigment and process for the production thereof An azobarbituric acid metal complex pigment comprising an azobarbituric acid metal complex of the formula (1), melamine and a compound of the formula (2), which pigment has an average primary particle diameter of 20 nm to 200 nm and a pigment primary particle aspect... | 07/25/2006 |
| 7077873 | Composition for the dyeing of human keratinous fibres comprising a monocationic monoazo dye A subject-matter of the disclosure is a novel composition for the dyeing of human keratinous fibres, for example, the hair, comprising a monocationic monoazo dye of formula (I) W1-NāNāW2-NW3-W4-W5, the dyeing processes employing it, the use of the dyes of formul... | 07/18/2006 |
| 7074906 | Organic solvent-free process for the preparation of 2-(2-nitrophenylazo)phenols Provided is a novel one-pot, organic solvent-free process for the preparation of 2-(2-nitrophenylazo) substituted phenols. The 2-(2-nitrophenylazo) substituted phenols are precursors for hydroxyphenylbenzotriazole UV absorbers. ... | 07/11/2006 |
| 7060110 | Dyeing composition for dyeing keratinous fibres comprising a particular dicationic monoazo dye The invention concerns a novel dyeing composition for dying keratinous fibers, in particular human hair, comprising a dicationic monoazo dye, and the dyeing method using said composition and the novel compounds of formulae (I) or (II). ... | 06/13/2006 |
| 6923856 | Method of improving pigment fluorescence A process for the preparation of organic pigments with enhanced fluorescence, which process comprises treating said pigments with a surfactant, and to the fluorescent organic pigments obtained by said process. The pigments according to the present invention can be u... | 08/02/2005 |
| 6913640 | Single-phase mixed crystals of laked monoazo dyes Novel improved single-phase mixed crystals of monoazo dyes laked with alkaline earth metal cations and ammonium cations in a molar ratio of about 1:2 having a fine particle size and substantially better fastness properties than similar known products are excellently... | 07/05/2005 |
| 6913641 | Laked monoazo pigments based on naphtholsulfonic acids The invention relates to novel monoazo compounds of formula (1), wherein R represents H or Cl, M2+ represents Ca2+ or SR2+ and Y1=H and Y2=SO3ā or Y1=SO3ā | 07/05/2005 |
| 6905808 | Color toner, and full-color image forming method A yellow toner in which, in a spectral-distribution diagram in which the reflectance (%) is plotted as ordinate and the wavelength (nm) as abscissa, the reflectance determined for a toner in a state of powder ranges from 15% to 20% at a wavelength of 500 nm and rang... | 06/14/2005 |
| 6902612 | Heat stable laked monoazo red pigment Disclosed is a red pigment represented by Formula I: having a unique X-ray diffraction pattern. Also disclosed is a red pigment composition containing the pigment represented by Formula I and a surfactant. Also disclos... | 06/07/2005 |
| 6756485 | Process for preparing a monoazo metal complex salt compound for charge control agent and toner for developing electrostatic images Charge control agent comprising a metal complex salt compound of Formula (I) containing substantially no monoazo compound constituting the ligand thereof, toner containing the charge control agent, and process for manufacturing a metal complex salt compound of Formu... | 06/29/2004 |
| 6756486 | Non-migrating metallized disazo green shade yellow pigment Disclosed are green shade yellow pigments represented by the Formula I: wherein R1 and R2 are independently selected from hydrogen, hydroxy, halogen, an alkyl group having 1 to about 4 carbon atoms,... | 06/29/2004 |
| 6706863 | Organic pigment with high transparency and hydrophobicity The present invention provides Pigment Yellow 180 having an excellent transparency produced by using a fine slurry of 5-acetoacetylamino-benzimidazolone as a coupling component when Pigment Yellow 180 is produced by coupling reaction of 5-acetoacetylamino-benzimidaz... | 03/16/2004 |
| 6576748 | Method for making dimeric azo pyridone colorants Disclosed is a process for preparing a diazopyridone compound either (A) of the formula ##STR1## or (B) of the formula ##STR2## which comprises diazotizing a dianiline and coupling it with a pyridone or diazotizing an aniline and coupling it with a d... | 06/10/2003 |
| 6566507 | Processes for the preparation of benzotriazole UV absorbers Provided is a process for preparing 2H-benzotriazole UV absorbers containing a perfluoroalkyl moiety at the 5-position of the benzo ring, for example a trifluoromethyl group, which involves diazotizing the perfluoroalkyl substituted o-nitroaniline using c... | 05/20/2003 |
| 6375733 | Heat stable monoazo magenta pigment compositions Disclosed are blue shade red to magenta monoazo pigments which are obtained by diazotization of 5-alkoxy-2-aminobenzenesulfonic acids, coupling of the diazonium compound with a hydoxynaphthalenesulfonic acid and subsequent laking of the coupling product w... | 04/23/2002 |
| 6281338 | Mono- and dipotassium salts of azo compounds Mono- or dipotassium salts of azo compounds conforming to the formula (I) or one of its tautomeric structures ##STR1## where R and R' are independently OH, NH2, NH--CN, acylamino or arylamino and R1 and R1' are independently --... | 08/28/2001 |
| 6254671 | Very green-shade yellow metallized disazo pigment In one embodiment, the present invention relates to a green shade yellow pigment composition comprising a compound having the formula: ##STR1## wherein R1 and R2 are independently hydrogen, halogen, an alkyl group having 1 to about 4... | 07/03/2001 |
| 6235100 | Metallized azo yellow pigments In one embodiment, the present invention relates to a method of preparing a medium shade yellow pigment composition comprising making an azo pigment by coupling (i) two or more diazonium components made from two or more aromatic amines including 2-amino-5... | 05/22/2001 |
| 6150509 | Water-insoluble yellow monoazo pigment A water-insoluble yellow monoazo pigment has the following formula (I): ##STR1##... | 11/21/2000 |
| 6133432 | Processes for preparing pesticidal intermediates A process for preparing a compound of the formula ##STR1## wherein R is C1 -C18 alkyl by reacting a compound of the formula RO2 C--CH2 CN (II) with a cyanide salt and formaldehyde o... | 10/17/2000 |
| 6111083 | Disperse dyes Disperse dyes of formula ##STR1## wherein R1 is nitro or cyano, R2 is halogen, R3 is C1 -C4 alkyl, R4 and R5 are each independently of the other methyl or ethyl and R6 | 08/29/2000 |
| 6090927 | Intermediates for preparing pyrazole derivatives The invention relates to novel intermediates in a process for preparing compounds having the formula: ##STR1## wherein R3, R4, R6 and Ar are as defined in the description, by reaction of a compound of formula (I) with... | 07/18/2000 |
| 6028178 | Pigment for electrophotographic toners and developers Azo pigment of the formula (1) ##STR1## which has a specific surface area of the pigment powder of more than 45 m2 /g. The azo pigment is particularly suitable as colorant in electrophotographic toners and developers, and in powder coating... | 02/22/2000 |
| 5998592 | Monoazo dyes containing a fluorosulphonyl group and use thereof A monoazo dye of the formula: ##STR1## wherein: R1 represents --C3 H6 CN, --C2 H4 Cl, --C3 H6 Cl, --C2 H4 OCOCH3 or --C2 H4... | 12/07/1999 |
| 5973126 | Azo compounds and process for producing the same A monoazo compound synthesized using 2-hydroxynaphthalene-3,6-dicarboxylic acid (or salt thereof), an amide, an ureide or an ester thereof as a coupler is novel, and is superior in water resistance, chemical resistance and solvent resistance. The present ... | 10/26/1999 |
| 5964899 | Azo dyes, their production and use Azo dyes containing sulphur dye entities as a constitutional component are dyes of valuable properties, in particular for the dyeing of leather.... | 10/12/1999 |
| 5942604 | Azo dye mixtures A dye mixture, which comprises as component (A) a dye of formula as component (B) a dye of formula ##STR1## and/or as component (C) a dye of formula ##STR2## wherein D, X and Y are as defined in the specification. These dyes are particularl... | 08/24/1999 |
| 5889162 | Strong green-shade yellow disazo pigment In one embodiment, the present invention relates to a green shade yellow pigment composition comprising a compound having the formula: ##STR1## wherein R1 and R2 are independently hydrogen, halogen, an alkyl group having 1 to ab... | 03/30/1999 |
| 5869628 | Disperse dyes Disperse dyes of formula ##STR1## wherein R1 is chloro or bromo, R2 is methyl or ethyl, and R3 is methyl or ethyl. The dyes are particularly suitable for dyeing or printing polyester fiber textile material.... | 02/09/1999 |
| 5852179 | Preparation of disperse azo dyestuffs in the presence of alkoxylated acetylenic diols The use of alkoxylated acetylenic diol surfactants in the aqueous synthesis of disperse azo dyes provides a simple process for improving filtration properties of dyestuff. The surfactants may be added prior to the coupling step of the synthesis or prior t... | 12/22/1998 |
| 5824117 | Nitrobenzisothiazole azo dyestuff The present invention relates to the dyestuff of the formula I ##STR1## modifications of this dyestuff which are stable during dyeing, processes for the preparation thereof and their use for dyeing and printing synthetic fiber materials.... | 10/20/1998 |
| 5770708 | Preparation of phenylazonaphthalenes A process for preparing aqueous preparations of azo dyes of the formula ##STR1## where R is hydrogen or C1 -C4 -alkyl and Kat.sym. is the equivalent of a cation which derives from a tertiary amine of the ethanolamine or propanolamine... | 06/23/1998 |
| 5747566 | Water-insoluble azo colorants based on aminoquinazolinediones Compound of the general formula (I) ##STR1## in which X is an O or S atom or an imino group, Y is an O atom or an imino group, R1 and R2 are a hydrogen atom, C1 -C4 -alkyl, an unsubstituted phenyl group or a sub... | 05/05/1998 |
