Patents by Inventor Tadayoshi Ichikawa

Tadayoshi Ichikawa 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).

  • Cleaning system using a solvent
    Patent number: 5193560
    Abstract: A cleaning method and cleaning system using an organic solvent such as Freon. A cleaning tank is closed after an article to be cleaned is placed within the cleaning tank. The solvent is supplied to the cleaning tank from a solvent storage tank. The article is cleaned with the supplied solvent. After the cleaning, the solvent is discharged in liquid state from the cleaning tank while vapor of the solvent which remains in the cleaning tank is discharged to a condenser to condense the vapor. The condensed solvent is returned from the condenser into the solvent storage tank. After the liquid solvent and vapor solvent are discharged from the cleaning tank, the cleaned article is taken out from the cleaning tank. The condenser is incorporated in a distiller. A solvent vapor supplying unit is connected to the cleaning tank. The thus provided closed system prevents release of Freon to the atmosphere.
    Type: Grant
    Filed: June 24, 1991
    Date of Patent: March 16, 1993
    Assignee: Kabushiki Kaisha Tiyoda Sisakusho
    Inventors: Masato Tanaka, Tadayoshi Ichikawa
  • Cleaning method using a solvent while preventing discharge of solvent vapors to the environment
    Patent number: 5051135
    Abstract: A cleaning method and cleaning system using an organic solvent such as Freon. A cleaning tank is closed after an article to be cleaned is placed within the cleaning tank. The solvent is supplied to the cleaning tank from a solvent storage tank. The article is cleaned with the supplied solvent. After the cleaning, the solvent is discharged in liquid state from the cleaning tank while vapor of the solvent which remains in the cleaning tank is discharged to a condenser to condense the vapor. The condensed solvent is returned from the condenser into the solvent storage tank. After the liquid solvent and vapor solvent are discharged from the cleaning tank, the cleaned article is taken out from the cleaning tank. The condenser is incorporated in a distiller. A solvent vapor supplying unit is connected to the cleaning tank. The thus provided closed system prevents release of Freon to the atmosphere.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: September 24, 1991
    Assignee: Kabushiki Kaisha Tiyoda Seisakusho
    Inventors: Masato Tanaka, Tadayoshi Ichikawa