Patents by Inventor Masahumi Imamura

Masahumi Imamura 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).

  • Method and apparatus for changing solvent composition in a solvent recovery system of a dewaxing apparatus
    Patent number: 5647971
    Abstract: A method and apparatus for changing the solvent composition in a solvent recovery system of a dewaxing apparatus, depending on the type of stock oil, by introducing a part of dry solvent into a wet solvent tank to thereby increase or decrease a concentration of MEK in the wet solvent used as a primary solvent for initially mixing with the stock oil.
    Type: Grant
    Filed: August 23, 1994
    Date of Patent: July 15, 1997
    Assignee: Nippon Petroleum Refining Company Limited
    Inventors: Akira Kawamura, Susumu Suzuki, Masahumi Imamura
  • Method and apparatus for changing solvent composition in a solvent recovery system of a dewaxing apparatus
    Patent number: 5611894
    Abstract: An apparatus for changing the solvent composition in a solvent recovery system of a dewaxing apparatus, depending on the type of stock oil, by introducing a part of dry solvent into a wet solvent tank to thereby increase or decrease a concentration of MEK in the wet solvent used as a primary solvent for initially mixing with the stock oil.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 18, 1997
    Assignee: Nippon Petroleum Refining Company Limited
    Inventors: Akira Kawamura, Susumu Suzuki, Masahumi Imamura