Patents by Inventor William M. Hung
William M. Hung has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4558137Abstract: The invention provides processes for the preparation of both known and novel [bis(substituted-aryl) (indolyl)]methanes and [(substituted-aryl) (heteryl) (indolyl)]methanes, useful as color formers, particularly in carbonless duplicating and thermal marking systems, which comprises the interaction of [bis(substituted-aryl) (phenylsulfonyl)]methanes and [(substituted-aryl) (heteryl) (phenylsulfonyl)]methanes with indoles in the presence of either an alkaline or an acidic catalyst.Type: GrantFiled: June 6, 1983Date of Patent: December 10, 1985Assignee: The Hilton-Davis Chemical Co.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4551740Abstract: 3-(R-Carbonyloxy)-7-(N-R.sup.1 -N-R.sup.2 -amino)-10-(RCO)-phenothiazines useful as color formers, particularly in electrochromic recording systems, are prepared by the interaction of the corresponding 7-(N-R.sup.1 -N-R.sup.2 -amino)phenothiazin-3-one with a reducing agent to obtain the corresponding leuco compound and subsequently interacting the leuco compound with about two molecular proportions of an acylating agent.Type: GrantFiled: July 31, 1984Date of Patent: November 5, 1985Assignee: The Hilton-Davis Chemical Co.Inventor: William M. Hung
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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: 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: 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: 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: 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: 4485242Abstract: 3-[(Alkoxy)(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 alcohols in the presence of a base.Type: GrantFiled: July 30, 1981Date of Patent: November 27, 1984Assignee: Sterling Drug Inc.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4447616Abstract: 2-And/or 6-pyridylethylamino-substituted fluorans useful as color formers, particularly in pressure-sensitive carbonless duplicating systems and thermal-responsive marking systems are prepared by the interaction of (pyridylethylaminophenyl)carbonylbenzoic acids with 4-hydroxy- or alkoxyanilines or by the interaction of (disubstituted aminophenyl)carbonylbenzoic acids with N-pyridylethyl-4-hydroxy- or alkoxy acetanilides. The (pyridylethylaminophenyl)carbonylbenzoic acid intermediates required for the fluorans are prepared by interacting a N-pyridylethyl-3-hydroxyaniline with a substituted or unsubstituted phthalic anhydride. The N-pyridylethyl-4-hydroxy- or alkoxyanilines and the N-pyridylethyl-3-hydroxyanilines are prepared by interacting the respective aniline with a vinylpyridine.Type: GrantFiled: November 30, 1982Date of Patent: May 8, 1984Assignee: Sterling Drug Inc.Inventors: William M. Hung, Edward E. Ehlinger
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Patent number: 4446321Abstract: Novel 4-aryl-or heteroaryl-2,6-bis[(substituted-amino)phenyl]pyridines which are useful as color formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting a 2-, 3- or 4-R.sub.1 R.sub.2 N-acetophenone with an aryl or heteroaryl aldehyde in the present of ammonia or an ammonia-releasing agent.Type: GrantFiled: June 3, 1982Date of Patent: May 1, 1984Assignee: Sterling Drug Inc.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4431819Abstract: 3-Heteroaryl-3-(diphenylamino)phthalides useful as color formers in pressure-sensitive carbonless duplicating systems, thermal marking systems and hectographic copying systems are prepared by reacting 2-(heteroarylcarbonyl)benzoic acids with diphenylamines.Type: GrantFiled: April 28, 1980Date of Patent: February 14, 1984Assignee: Sterling Drug Inc.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4417059Abstract: This invention relates to 3,7-bis(disubstituted aminophenyl- or indolyl)-3,7-bis(diphenylamino)pyromellitides, 3,5-bis(disubstituted aminophenyl- or indolyl)-3,5-bis(diphenylamino)pyromellitides and mixtures thereof useful as color formers, particularly in carbonless duplicating and thermal marking systems, which are prepared by the interaction of 2,5-bis(disubstituted aminophenyl- or indolyl)carbonyl-1,4-benzenedicarboxylic acids or 2,4-bis(disubstituted aminophenyl- or indolyl)carbonyl-1,5-benzenedicarboxylic acids and mixtures thereof with diphenylamines.Type: GrantFiled: August 19, 1981Date of Patent: November 22, 1983Assignee: Sterling Drug Inc.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4414399Abstract: 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)benzoid acids and substituted 4-hydroxyacetanilides or alkyl phenols which are esterified with alkyl halides or dialkyl sulfates.Type: GrantFiled: April 15, 1983Date of Patent: November 8, 1983Assignee: Sterling Drug Inc.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4403791Abstract: The invention provides processes for the preparation of both known and novel [bis(substituted-aryl)(indolyl)]methanes and [(substituted-aryl)(heteryl)(indolyl)]methanes, useful as color formers, particularly in carbonless duplicating and thermal marking systems, which comprises the interaction of [bis(substituted-aryl)(phenylsulfonyl)]methanes and [(substituted-aryl)(heteryl)(phenylsulfonyl)]methanes with indoles in the presence of either an alkaline or an acidic catalyst.Type: GrantFiled: August 6, 1981Date of Patent: September 13, 1983Assignee: Sterling Drug Inc.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4398030Abstract: 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: January 22, 1982Date of Patent: August 9, 1983Assignee: Sterling Drug Inc.Inventors: Paul J. Schmidt, William M. Hung
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Patent number: 4396767Abstract: 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: March 16, 1981Date of Patent: August 2, 1983Assignee: Sterling Drug Inc.Inventors: Paul J. Schmidt, William M. Hung