Patents by Inventor Ayumu Fujita

Ayumu Fujita 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).

  • Process for producing mixed gas of lower olefin and lower aliphatic carboxylic acid, and process for producing lower aliphatic ester using the mixed gas
    Patent number: 6818790
    Abstract: A process for producing a lower aliphatic ester by catalytically reacting a lower olefin and a lower aliphatic carboxylic acid in a gas phase, where the lower aliphatic carboxylic acid is gasified at a relatively low temperature and thereby a mixed gas of the lower olefin and the lower aliphatic carboxylic acid is produced.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: November 16, 2004
    Assignee: Showa Denko K.K.
    Inventors: Ayumu Fujita, Hiroshi Uchida
  • Catalyst for use in producing lower aliphatic carboxylic acid ester, process for producing the catalyst, and process for producing lower aliphatic carboxylic acid ester using the catalyst
    Publication number: 20040152915
    Abstract: A process for producing a lower aliphatic carboxylic acid ester, comprises reacting a lower aliphatic carboxylic acid with a lower alcohol in a gas phase in the presence of a catalyst. The catalyst comprises an inorganic support having supported thereon at least one heteropolyacid and/or a salt thereof. The catalyst exhibits high initial activity and is able to stably and continuously perform the reaction.
    Type: Application
    Filed: January 23, 2004
    Publication date: August 5, 2004
    Applicant: SHOWA DENKO K.K.
    Inventors: Ayumu Fujita, Etsuko Kadowaki, Tomoyoshi Higashi, Hiroshi Uchida
  • Process for producing lower aliphatic carboxylic acid ester
    Patent number: 6696598
    Abstract: A process for producing a lower aliphatic carboxylic acid ester by a gas phase esterification reaction starting from a lower aliphatic carboxylic acid and a lower olefin, comprising adding a lower alcohol corresponding to a hydrate of a lower olefin to the gas phase reaction product, condensing a lower aliphatic carboxylic acid and the lower alcohol and while allowing the conversion into a lower aliphatic carboxylic acid ester to proceed, separating the lower aliphatic carboxylic acid ester. Productivity is increased due to the improvement of the conversion of a lower aliphatic carboxylic acid.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: February 24, 2004
    Assignee: Showa Denko K.K.
    Inventors: Ayumu Fujita, Etsuko Kadowaki, Meiko Saihata, Hiroshi Uchida
  • Catalyst for use in producing lower aliphatic carboxylic acid ester, process for producing the catalyst,and process for producing lower aliphatic carboxylic acid ester using the catalyst
    Publication number: 20030135069
    Abstract: A catalyst, for use in producing a lower aliphatic carboxylic acid ester, which is used in producing a lower aliphatic carboxylic acid ester by esterifying a lower aliphatic carboxylic acid with a lower alcohol in a gas phase and which can exhibit high initial activity and is able to stably and continuously perform the reaction. The catalyst comprises an inorganic support having supported thereon at least one heteropolyacid and/or a salt thereof.
    Type: Application
    Filed: October 5, 2001
    Publication date: July 17, 2003
    Inventors: Ayumu Fujita, Etsuko Kadowaki, Tomoyoshi Higashi, Hiroshi Uchida
  • Process for producing lower aliphatic carboxylic acid ester
    Publication number: 20030040641
    Abstract: A process for producing a lower aliphatic carboxylic acid ester by a gas phase esterification reaction starting from a lower aliphatic carboxylic acid and a lower olefin, comprising adding a lower alcohol corresponding to a hydrate of a lower olefin to the gas phase reaction product, condensing a lower aliphatic carboxylic acid and the lower alcohol and while allowing the conversion into a lower aliphatic carboxylic acid ester to proceed, separating the lower aliphatic carboxylic acid ester. Productivity is increased due to the improvement of the conversion of a lower aliphatic carboxylic acid.
    Type: Application
    Filed: December 14, 2001
    Publication date: February 27, 2003
    Inventors: Ayumu Fujita, Etsuko Kadowaki, Meiko Saihata, Hiroshi Uchida