Patents by Inventor Tsutomo Naito

Tsutomo Naito 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).

  • Solvent dewaxing waxy hydrocarbon oils using dewaxing aid
    Patent number: 4339619
    Abstract: In a solvent dewaxing process wherein a waxy hydrocarbon oil is mixed with a dewaxing aid and dewaxing solvent and chilled to form a slurry comprising solid particles of wax and a mixture of dewaxed oil and solvent, the improvement which comprises using a polymeric dewaxing aid comprising a condensation product of naphthalene and chlorinated wax having an average molecular weight ranging from about 20,000 to 500,000 and a molecular weight distribution exceeding the range of from about 10,000 to 1,000,000.
    Type: Grant
    Filed: August 21, 1980
    Date of Patent: July 13, 1982
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Takashi Onodera, Kikuji Komine, Fumio Ohashi, Tsutomo Naito
  • Solvent dewaxing waxy hydrocarbon oils using dewaxing aid
    Patent number: 4315813
    Abstract: In a solvent dewaxing process wherein a waxy hydrocarbon oil is mixed with a dewaxing aid and dewaxing solvent and chilled to form a slurry comprising solid particles of wax and a mixture of dewaxed oil and solvent, the improvement which comprises using a polymeric dewaxing aid comprising a condensation product of naphthalene and chlorinated wax having an average molecular weight ranging from about 20,000 to 500,000 and a molecular weight distribution exceeding the range of from about 10,000 to 1,000,000.
    Type: Grant
    Filed: July 21, 1978
    Date of Patent: February 16, 1982
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Takashi Onodera, Kikuji Komine, Fumio Ohashi, Tsutomo Naito