Patents Assigned to Hilton-Davis Chemical Co.
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Patent number: 4549192Abstract: 4-(N-Acylamino)-8-(N--R.sup.1 --N--R.sup.2 -amino)imidazophenoxazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 1,3-diamino-7-(N--R.sup.1 --N--R.sup.2 -amino)phenoxazinium halide with a reducing agent to obtain the corresponding leuco compound and subsequently interacting the leuco compound with at least two molecular proportions of an acylating agent.Type: GrantFiled: July 31, 1984Date of Patent: October 22, 1985Assignee: The Hilton-Davis Chemical Co.Inventor: William M. Hung
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Patent number: 4540790Abstract: Novel 4-[4-(substituted-amino)phenyl]- or heteroaryl-2,6-bis(heteroaryl)pyridines which are useful as color formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting a heteroaryl methyl ketone with a 2-R.sub.4 -4-NR.sub.5 R.sub.6 -benzaldehyde or a heteroaryl aldehyde in the presence of ammonia or an ammonia-releasing agent.Type: GrantFiled: April 25, 1983Date of Patent: September 10, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4539579Abstract: This invention relates to mono- and bis(aryl- and/or heteroaryl)-substituted-phthalazinones, phthalimidines, pyridopyridazinones and pyrrolopyridinones useful as color-forming substances, particularly in electrochromic recording systems, which are prepared by the interaction of a mono- or bis-substituted-phthalide or furopyridinone with a substituted or unsubstituted hydrazine.Type: GrantFiled: November 5, 1982Date of Patent: September 3, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4537971Abstract: This invention relates to improved processes for the manufacture of quinolinic acid run with a higher concentration of reactants in the initial step wherein quinoline is oxidized with hydrogen peroxide in an aqueous sulfuric acid solution in the presence of copper sulfate to prepare copper quinolinate, and in subsequent steps converting the copper quinolinate from the initial step to quinolinic acid by treating the copper salt with alkali to form the water soluble alkali salt form of quinolinic acid precipitating the copper as insoluble cupric oxide and thereafter treating the soluble alkali salt form with acid to obtain the quinolinic acid, the improvement whereby the reaction of the initial step is carried out in a thermally controllable and safe manner and the formation of by-products is minimized which comprises in the initial step adding separately either in portion-wise multiple and approximately equal portions or adding continuously and simultaneously over a period of time each of the following, the suType: GrantFiled: September 26, 1983Date of Patent: August 27, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: Robert W. J. Rebhahn, James E. Kassner, Raymond E. Werner
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Patent number: 4536368Abstract: A method for sanitizing flush toilets wherein a sanitizing agent and a triphenylmethane dyestuff are dispensed into the toilet flush water. The dyestuff is resistant to attack by the sanitizing and therefore provides an aesthetically pleasing color to the water remaining in the bowl during the time period between flushes.Type: GrantFiled: December 9, 1983Date of Patent: August 20, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: William M. Hung, Jack M. Knox
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Patent number: 4536570Abstract: This invention relates to novel mixtures consisting essentially of benzanilide bridged disazo compounds which are randomly substituted with x (N-substituted sulfonamido) groups, to acid-addition salts of said disazo compounds, useful as direct dyes particularly in the dyeing of cellulose, and to methods of preparation of said mixtures of (N-substituted sulfonamido) substituted disazo compounds.Type: GrantFiled: October 25, 1982Date of Patent: August 20, 1985Assignee: The Hilton-Davis Chemical Co.Inventor: Nathan N. Crounse
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Patent number: 4536367Abstract: A method for sanitizing flush toilets wherein a sanitizing agent and a triphenylmethane dyestuff are dispensed separately from a dual dispensing means into the toilet flush water. The dyestuff is resistant to attack by the sanitizing agent and therefore provides an aesthetically pleasing color to the water remaining in the bowl during the time period between flushes.Type: GrantFiled: December 9, 1983Date of Patent: August 20, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: William M. Hung, Patrick J. Jefferies
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Patent number: 4535172Abstract: This invention relates to 3-aryl or heteroaryl-3-alkoxy, phenoxy-, alkylthio- or phenylthiophthalides useful as color formers, particularly in carbonless duplicating and thermal marking systems, which are prepared by the interaction of 2-(disubstituted amino)phenylcarbonylbenzoic acids with an acid chloride or an anhydride of an alkanoic acid in the first step and a further reaction of the product of the first step with an alcohol, a thioalcohol, a phenol or a thiophenol in a second step.Type: GrantFiled: January 8, 1982Date of Patent: August 13, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4528136Abstract: Process comprises the combination of the two steps of condensing Y-benzaldehyde with N-R.sup.2 -N-R.sup.3 -aniline and 3-N-R-N-R.sup.1 -benzoic acid, under acidic conditions to produce 2-[(Y-phenyl) (4-N-R.sup.2 -N-R.sup.3 -aminophenyl)methyl]-5-N-R-N-R.sup.1 -aminobenzoic acid, and oxidizing said benzoic acid to produce 3-(Y-phenyl)-3-(4-N-R.sup.2 -N-R.sup.3 -aminophenyl)-6-N-R-N-R.sup.1 -aminophthalide.Type: GrantFiled: April 14, 1983Date of Patent: July 9, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: Paul J. Schmidt, Patrick J. Jefferies
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Patent number: 4515971Abstract: Dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans, 2-amino and substituted amino-5'/6'-carboxyfluorans, 1,3-dialkyl-5'/6'-carboxyfluorans, esterified dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans, 2-amino and substituted amino-5'/6'-carboxyfluorans, 1,3-dialkyl-5'/6'-carboxyfluorans and 3,3-(corresponding-substituted-diaryl)-5/6-carboxyphthalides useful as color formers, particularly in carbonless duplicating and thermal marking systems, are prepared by the interaction of 4/5-carboxy-2-(4-dialkylamino-substituted-2-hydroxybenzoyl)benzoic acids and substituted diphenylamines to produce the phthalides which are then subjected to ring closure to produce the carboxyfluorans and by the interaction of 4/5-carboxy-2-(4-dialkylamino-substituted-2-hydroxybenzoyl)benzoic acids and substituted 4-hydroxyacetanilides or alkyl phenols which are esterified with alkyl halides or dialkyl sulfates.Type: GrantFiled: July 6, 1981Date of Patent: May 7, 1985Assignee: Hilton-Davis Chemical Co.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4507483Abstract: 3-[(Substituted-amino)(aryl or heteroaryl)methyl]-1H-indoles which are useful as color-formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting 3-[(arylsulfonyl)(aryl or heteroaryl)methyl]-1H-indoles with amines or precursors thereof in the presence of a base.Type: GrantFiled: March 9, 1983Date of Patent: March 26, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4494989Abstract: Mono and bis substituted (arylsulfonyl)alkanes useful as color formers, particularly in carbonless duplicating and thermal marking systems, are prepared by the interaction of the appropriate aldehyde or dialdehyde with the appropriate aryl or heterocyclic moiety and the appropriate phenylsulfinic acid in the presence of a catalyst.Type: GrantFiled: July 19, 1982Date of Patent: January 22, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4477676Abstract: Mono-, bis- and tris-indolyl-substituted furanones useful as color formers, particularly in carbonless duplicating and thermal marking systems, which are prepared respectively by: the interaction of an indole with mucochloric acid; the interaction of an indole with a 4-mono(indolyl)-substituted 4-oxo-2-butenoic acid; and by the interaction of an indole with a 2,4-bis(indolyl)-substituted 4-oxobutanoic acid or with a 3,5-bis(indolyl)-substituted furanone.Type: GrantFiled: July 6, 1982Date of Patent: October 16, 1984Assignee: The Hilton-Davis Chemical Co.Inventors: Nathan N. Crounse, Paul J. Schmidt
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Patent number: 4451657Abstract: Mono-, bis- and tris-indolyl-substituted furanones useful as color formers, particularly in carbonless duplicating and thermal marking systems, which are prepared respectively by: the interaction of an indole with mucochloric acid; the interaction of an indole with a 4-mono(indolyl-substituted 4-oxo-2-butenoic acid; and by the interaction of an indole with a 2,4-bis(indolyl)-substituted 4-oxobutanoic acid or with a 3,5-bis(indolyl)-substituted furanone.Type: GrantFiled: November 16, 1979Date of Patent: May 29, 1984Assignee: The Hilton-Davis Chemical Co.Inventors: Nathan N. Crounse, Paul J. Schmidt
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Patent number: 4448722Abstract: Storage-stable aqueous compositions containing dissolved water-soluble novel acid addition salts of poly(N-substituted sulfonamido) phthalocyanines which are prepared by the interaction of a single acid or a mixture of acids and poly(N-substituted sulfonamido) phthalocyanines, are useful for direct dyeing, particularly the dyeing of cellulose.Type: GrantFiled: September 27, 1982Date of Patent: May 15, 1984Assignee: The Hilton-Davis Chemical Co.Inventor: Nathan N. Crounse