Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 7247593 | Catalyst for aromatization of alkanes, process of making and using thereof A catalyst, a process for making the catalyst and a process for using the catalyst in aromatization of alkanes to aromatics, specifically, aromatization of alkanes having two to six carbon atoms per molecule, such as propane, to aromatics, such as benzene, toluene a... | 07/24/2007 |
| 6670487 | Method for removing impurities from oxidation products Disclosed is a method for removing impurities from products derived from oxidation of an ortho-dialkylaromatic compound which comprises at least one step selected from the group consisting of extraction of an aqueous solution comprising aromatic dicarboxy... | 12/30/2003 |
| 6657067 | Method for the manufacture of chlorophthalic anhydride A method for the manufacture of chlorophthalic acid by liquid phase oxidation of chloro-ortho-xylene is disclosed. The chlorophthalic acid may be dehydrated to form chlorophthalic anhydride which is useful in the synthesis of polyetherimide.... | 12/02/2003 |
| 6657068 | Liquid phase oxidation of halogenated ortho-xylenes A method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful in the synthesis of polyetherimide.... | 12/02/2003 |
| 6653321 | Naphthylsulfonic acids and related compounds as glucose uptake agonists Methods for treating conditions associated with hyperglycemia, especially Type II diabetes, with novel naphthylsulfonic acids and related compounds. These compounds, as single stereoisomers or mixtures of stereoisomers, or their pharmaceutically acceptabl... | 11/25/2003 |
| 6649773 | Method for the manufacture of halophthalic acids and anhydrides A method for the manufacture of halophthalic acid by liquid phase oxidation of halo-ortho-xylene is disclosed. The halophthalic acid may be dehydrated to form halophthalic anhydride which is useful in the synthesis of polyetherimide.... | 11/18/2003 |
| 6528663 | Methods for the preparation of 4-chlorophthalic anhydride A method for the synthesis of substituted phthalic anhydrides (IV) ##STR1## wherein R' is a halogen, aromatic or aliphatic group comprising 1-18 carbons, hydrogen or nitro group is the transimidation between a substituted N-alkyl phthalimide (V) ##ST... | 03/04/2003 |
| 6031061 | Bis (triaklyltrimellitic anhydride) derivative and polyesterimide for optical communications formed therefrom A bis(trisubstitutedtrimellitic anhydride) derivative and a polyesterimide for optical communications, the polyesterimide being formed therefrom. The polyesterimide has a high refractive index, so that when using such polyesterimide as a material for a co... | 02/29/2000 |
| 5977379 | Process for the preparation of flame-resistant halogenated imide compounds The invention relates to the preparation of halogenated imides derived from hydrazine, a halogen and a dicarboxylic acid anhydride and capable of being employed as fireproofing agents for plastics. A dicarboxylic acid anhydride is halogenated with bromine, chl... | 11/02/1999 |
| 5648504 | Process for producing tetrafluorophthalic anhydride A process for producing tetrafluorophthalic anhydride, which comprises chlorinating tetrachlorophthalic anhydride to obtain 3,3,4,5,6,7-hexachloro-1-[3H]-isobenzofuranone, then fluorinating it to obtain 3,4,5,6-tetrafluorophthaloyldifluoride and/or 3... | 07/15/1997 |
| 5574172 | Process for producing halogenated phthalic anhydride The disclosure describes a process for producing halogenated phthalic anhydride, which comprises reacting phthalic anhydride with a molecular halogen in vapor phase in the presence of a catalyst containing zeolite as active component.... | 11/12/1996 |
| 5523476 | Processes for producing tetrafluorophthalic anhydride and fluorobenzoic acids A process for producing tetrafluorophthalic anhydride, which comprises chlorinating tetrachlorophthalic anhydride to obtain 3,3,4,5,6,7-hexachloro-1-[3H]-isobenzofuranone, then fluorinating it to obtain 3,4,5,6-tetrafluorophthaloyldifluoride and/or 3... | 06/04/1996 |
| 5493033 | Process for purifying tetrachlorophthalic anhydride In the purification of crude tetrachlorophthalic anhydride containing hexachlorobenzene as impurities, this invention relates to purification by decomposition in which crude tetrachlorophthalic anhydride is contacted with chlorine gas in fuming sulfuric a... | 02/20/1996 |
| 5405995 | Difluorophthalic compounds and their preparation Disclosed are novel compounds having the formula ##STR1## where A is O or NR, each R' independently selected from hydrogen, R, or M, R is alkyl, aryl, alkaryl, or aralkyl from C1 to C12, and M is a cation. Also disclosed is a me... | 04/11/1995 |
| 5384413 | Process for the preparation of tetrafluorophthalic acid and/or tetrafluorophthalic anhydride The present invention relates to a process for the preparation of tetrafluorophthalic acid and/or tetrafluorophthalic anhydride by reacting a compound of the formula ##STR1## in which X is a radical ##STR2## which is optionally mono- or pol... | 01/24/1995 |
| 5322954 | Synthesis of 4-substituted phthalic anhydrides Disclosed is a method of making a 4-substituted phthalic anhydride. A halomaleic (including halofumaric anhydride (or the acid or ester thereof) is made by the reaction of-maleic anhydride with chlorine or bromine. The halomaleic anhydride is reacted with... | 06/21/1994 |
| 5288879 | Tetrahalophthalic anhydride process This invention relates to an improvement in a process for preparing tetrabromophthalic anhydride whereby there is a substantial recovery of reactants such as halogen and SO3 from a vent stream exiting the reaction vessel. The improvement compri... | 02/22/1994 |
| 5233054 | Process for the preparation of halophthalic anhydrides Halophthalic anhydrides are prepared by the liquid phase reaction of a brominating agent with halogen substituted hexa- or tetra-hydrophthalic anhydrides.... | 08/03/1993 |
| 5225573 | Intermediates to tetrabromophthalic anhydride and process therefor Tetrabromophthalic anhydride and the corresponding free acid are propared by oxidizing in the liquid phase a compound of the formula ##STR1## each of A and A' is independently selected from oxygen, OH or acetoxy; each of R and R' is independently sel... | 07/06/1993 |
| 5206391 | Process for the preparation of halophthalic anhydrides A process for the preparation of a halophthalic anhydride, such as chlorophthalic anhydride, comprising the liquid phase reaction of bromine with a halogen substituted hexa- or tetra-hydrophthalic anhydride to produce halophthalic anhydride and gaseous HB... | 04/27/1993 |
| 5200556 | Process for the preparation of 3,4,6-trifluorophthalic acid and the anhydride thereof Process for the preparation of 3,4,6-tetrafluorophthalic acid of the formula (1) ##STR1## or the anhydride thereof in good yields and in an advantageous manner, by dehalogenating tetrafluorophthalic anhydride of the formula (2) ##STR2## or ... | 04/06/1993 |
| 5185454 | Process for the preparation of symmetrical diarylacetylenes Symmetrical diaryl-acetylenes can be prepared by reacting an aryl halide with acetylene in the presence of a palladium catalyst and a base. If the acetylene is introduced into the liquid reaction mixture using a high intensity gas dispersion means, the ar... | 02/09/1993 |
| 5086188 | Preparation of 3,5-dichlorophthalic acid and 3,5-dichlorophthalic anhydride Plychlorophthalimides, specifically, N-substituted tetrachlorophthalimides and N-substituted trichlorophthalimides may be treated with zinc and a base in aqueous soluction to yield, after acidification, the product 3,5-dichlorophthalic acid or salts there... | 02/04/1992 |
| 5059697 | Preparation of halogenated phthalic anhydrides A process for the aromatization of 4-chlorotetrahydrophthalic anhydride and 4,5-dichlorotetrahydrophthalic anhydride which comprises heating a solution of either substance in the presence of activated carbon and in the partial absence of air.... | 10/22/1991 |
| 5049682 | Process for the preparation of halophthalic anhydrides Halophthalic anhydrides are prepared by the liquid phase reaction of a brominating agent with halogen substituted hexa- or tetra-hydrophthalic anhydrides.... | 09/17/1991 |
| 5003088 | Method for the preparation of halophthalic anhydrides Halophthalic anhydrides are prepared by reaction of chlorine with a saturated or partially saturated halophthalic anhydride at a temperature of 200° to 500° Celsius.... | 03/26/1991 |
| 4978760 | Preparation of halogen substituted phthalic anhydride A process for the preparation of halogen substituted phthalic anhydrides of the formula: ##STR1## wherein x is a halogen, by the reaction of a halogen substituted tetrahydrophthalic phthalic anhydride of the formula ##STR2## or a geminal di... | 12/18/1990 |
| 4962206 | Process for the preparation of 4-bromophthalic anhydride A process for the production of 4-bromophthalic anhydride which comprises the reaction of 4-chlorotetrahydrophthalic anhydride with elemental bromine, in the presence of a catalytically effective amount of iron or an iron salt is disclosed.... | 10/09/1990 |
| 4814467 | Processes using a phosphorus complex A process for chlorinating compounds containing a carbon atom bonded to a hetero-atom selected from the group consisting of oxygen, nitrogen and sulfur; said process comprises contacting the carbon hetero-atom containing compound with a chloro phosphorus ... | 03/21/1989 |
| 4785114 | Quinophthalone dyes Quinophthalone dyes of the formula ##STR1## where X is O or NC--C--R, where R is cyano, unsubstituted or N-substituted carbamyl, carboalkoxy, quinazolonyl, quinoxalinonyl, benzimidazolyl or benzothiazolyl and the rings A, B, the quinoline system and/... | 11/15/1988 |
| 4785121 | Preparation of halophthalic anhydrides A process for selectively substituting an aromatic nitro group of a nitrophthalic anhydride with a halo group which comprises contacting the nitroaromatic-containing compound with a phosphorus halide of formula: wherein n is selected from 0, 1, 2 and 3; R is s... | 11/15/1988 |
| 4709056 | 4,4-dihalohexahydrophthalic anhydrides and 4-fluorotetrahydrophthalic anhydride, and process for their preparation 4,4-dihalohexahydrophthalic anhydrides of the formula ##STR1## where Y is chlorine or fluorine, are prepared by the reaction of hydrogen fluoride with 4-chlorotetrahydrophthalic anhydride. The 4,4-dihalohexahydrophthalic anhydrides of this invention can b... | 11/24/1987 |
| 4684737 | Process for producing substituted phthalic acid compounds A process for producing a substituted phthalic acid which comprises heating a substituted tetrahydrophthalic acid compound having a substituent in at least one of the 3-, 4-, 5- and 6-positions in the presence of sulfur to dehydrogenate it, and heat-treat... | 08/04/1987 |
| 4650880 | Purification of substituted phthalic anhydrides A process for purifying crude substituted phthalic anhydrides, e.g. 4-methylphthalic anhydride, derived from the dehydrogenation in the presence of bromine of a Diels-Alder addition product of a conjugated diene, e.g. isoprene, and maleic anhydride. In th... | 03/17/1987 |
| 4562254 | Preparation of 5-fluoro-2-phenyl-4H-3,1-benzoxazin-4-ones 5-Fluorobenzoxazinones (I) ##STR1## where R is hydrogen, halogen, C1 -C3 -alkyl, or trifluoromethyl, trifluoromethoxy, chlorodifluoromethoxy, difluoromethoxy, tetrafluoroethoxy, trifluoromethylmercapto or chlorodifluoromethylmer... | 12/31/1985 |
| 4559405 | Process for preparing substituted phthalic anhydrides A process for preparing substituted phthalic anhydrides, e.g. 4-methylphthalic anhydride, in which the Diels-Alder addition product of a conjugated diene, e.g. isoprene, and maleic anhydride is reacted with bromine in the presence of an acid acceptor. Typ... | 12/17/1985 |
| 4517372 | Process for the preparation of 4-fluorophthalic anhydride This invention relates to a process for the preparation of 4-fluorophthalic anhydride which comprises contacting a dihalohexahydrophthalic anhydride of the formula ##STR1## where X is Cl or F, with a dehydrogenation catalyst. Advantageously, the ... | 05/14/1985 |
| 4514572 | Preparation of fluorophthalic anhydrides Fluorophthalic anhydrides containing 1 or 2 fluorine atoms are prepared by a process in which a chlorophthalic anhydride containing 1 or 2 chlorine atoms is treated with an acid chloride of sulfurous acid or of carbonic acid in the presence of an aliphati... | 04/30/1985 |
| 4329287 | Halo-(carbonyldioxyaryl)ethylenes Halo-(carbonyldioxyaryl)ethylenes are prepared by a catalytic process which comprises contacting a halo-bis(hydroxyaryl)ethylene, carbon monoxide, an oxidant, a base, and a Group VIIIB element selected from ruthenium, rhodium, palladium, osmium, iridium o... | 05/11/1982 |
| 4302396 | Chlorinated 4-methylphthalic anhydrides Novel chlorinated 4-methylphthalic acids or anhydrides of the general formula ##STR1## wherein n is an integer of 1, 2 or 3, with the proviso that when n is 1, the chlorine atom is positioned at 3- or 5-position and when n is 2, the chlorine ato... | 11/24/1981 |
