American Hoechst Corporation

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
C07D HETEROCYCLIC COMPOUNDS 1161
 
  
 
F02C GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS 158

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5237813 Annular combustor with outer transition liner coolingAug 21, 92Aug 24, 93[F02C]
RE30809 Method of preparation of 3-(3-carboxy-4-hydroxyphenyl)-4,5-dihydro-2-phenylbenz [e]indole and valuable intermediates related theretoAug 13, 79Dec 01, 81[C07D]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4942000 Contactless knurling process for winding of high modulus thermoplastic filmsExpiredJul 30, 86Jul 17, 90[B29C]
4863827 Postive working multi-level photoresistExpiredOct 20, 86Sep 05, 89[G03F]
4822720 Water developable screen printing compositionExpiredJun 16, 87Apr 18, 89[G03C, G03F]
4816591 6,11-dihydrodibenz[b,e]oxepin-acetic acids and derivativesExpiredNov 05, 79Mar 28, 89[C07D]
4790293 Apparatus and method for solar heating of waterExpiredFeb 10, 84Dec 13, 88[F24J, E04H]
4769182 Process for production of 3-(hydroxyphenylphosphinyl)-propanoic acidExpiredJun 05, 85Sep 06, 88[C07F]
4769446 Fiber-reactive red azo dyestuffExpiredApr 18, 83Sep 06, 88[C09B, D06P]
4762524 Composition comprising the addition product of a vinyl-sulfone dye and a secondary amine and process for dyeing a polyamide therewithExpiredFeb 05, 87Aug 09, 88[C09B]
4760134 Process for the preparation of the copper complex disazo compounds from disazo compounds containing an O'-alkoxyaniline group by coppering dimethylation at a pH at about 3-6ExpiredAug 28, 85Jul 26, 88[C09B]
4729935 Process for the production of photographic images utilizing a negative working diazo contact filmExpiredOct 18, 85Mar 08, 88[G03C, G03F]
4728597 Desensitizing solution for lithographic printing platesExpiredFeb 17, 87Mar 01, 88[G03F]
4709037 Biotinylating agentsExpiredFeb 17, 87Nov 24, 87[C07D]
4692397 Process for developing an aqueous alkaline development diazo photographic elementExpiredNov 27, 85Sep 08, 87[G03F]
4692398 Process of using photoresist treating composition containing a mixture of a hexa-alkyl disilazane, propylene glycol alkyl ether and propylene glycol alkyl ether acetateExpiredOct 28, 85Sep 08, 87[G03C]
4681723 Calender band stripping section and process for stripping calendered sheetExpiredNov 01, 85Jul 21, 87[B29C]
4664709 Azoacylacetamide dispersing agents and azo-pigment compositionsExpiredFeb 25, 85May 12, 87[C07C]
4665216 Process for producing n-acyl-acyloxy aromatic aminesExpiredMar 12, 85May 12, 87[C07C]
4661056 Turbulent incineration of combustible materials supplied in low pressure laminar flowExpiredMar 14, 86Apr 28, 87[F23G, F23J, F23D]
4659523 Production of iodine stainable polyester polarizer filmExpiredNov 30, 84Apr 21, 87[B29D]
4659774 Support for solid-phase oligonucleotide synthesisExpiredNov 01, 85Apr 21, 87[C07H, C08F]

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