Patents Assigned to Youichiro Nagasu
  • Agent for inhibiting proliferation of human malignant tumor cells
    Patent number: 4963358
    Abstract: An agent for inhibiting proliferation of human malignant tumor cells is obtained by culturing the human malignant tumor cells in a medium and removing the malignant tumor cells from the cultured medium.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: October 16, 1990
    Assignees: Koken Ltd., Tadakatsu Oishi, Youichiro Nagasu, Hisao Yamaguchi
    Inventor: Tomoyuki Tajima
  • Agent for inhibiting proliferation of human malignant tumor cells
    Patent number: 4810495
    Abstract: An agent for inhibiting proliferation of human malignant tumor cells is obtained by culturing the human malignant tumor cells in a medium and removing the malignant tumor cells from the cultured medium.
    Type: Grant
    Filed: October 7, 1985
    Date of Patent: March 7, 1989
    Assignees: Koken Ltd., Tadakatsu Oishi, Youichiro Nagasu, Hisao Yamaguchi
    Inventor: Tomoyuki Tajima
  • Process for preparing an inhibiting agent against proliferation of animals malignant tumor cells
    Patent number: 4595657
    Abstract: The present invention relates to a process for preparing an inhibiting agent against the proliferation of malignant tumor cells of animals including human beings by cultivating animal malignant tumor cells, removing said malignant tumor cells from the culture medium and successively isolating a fraction having a molecular weight not less than 500 by fractional filtration.
    Type: Grant
    Filed: February 23, 1984
    Date of Patent: June 17, 1986
    Assignees: Koken Ltd., Youichiro Nagasu
    Inventor: Tomoyuki Tajima