Patents by Inventor Mayumi Yoshida

Mayumi Yoshida 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).

  • Charging device for electrophotographic equipment
    Patent number: 5272507
    Abstract: A scorotron charging device applicable to electrophotographic image forming equipment and having a main charger with discharge wires and a grid and applying voltages to the wires and the grid by respective power sources. The two power sources are controlled by the same control signal. In response to the control signal, a voltage starts being applied to the grid before a voltage is applied to said wires and ends being applied to the grid after the voltage application to the wires has ended. This allows the charge potential of a photoconductive element to rise and fall rapidly.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: December 21, 1993
    Assignee: Rioch Company, Ltd.
    Inventors: Mayumi Yoshida, Yusuke Shimbo
  • Compound UCA1064-B
    Patent number: 5236929
    Abstract: Disclosed is UCA1064-B, a compound represented by formula (I): ##STR1## and having an antibacterial, antifungal and anti-tumor activity. UCA1064-B is produced by culturing a microorganism belonging to the genus Wallemia.
    Type: Grant
    Filed: March 10, 1992
    Date of Patent: August 17, 1993
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Tatsuya Tamaoki, Isami Takahashi, Katsuhiko Ando, Mayumi Yoshida, Toshiaki Iwazaki
  • Bioxanthracene derivatives
    Patent number: 5081264
    Abstract: A compound of formula (I): ##STR1## wherein R.sub.1 represents hydrogen, hydroxy or acetoxy and R.sub.2 represents hydroxy or acetoxy.The compounds are capable of protecting the nerve cells and also antagonistic activity against N-methyl-D-aspartic acid receptors.They may be prepared by fermentation of a microorganism of the genus Verticillium or a mutant thereof.
    Type: Grant
    Filed: September 18, 1990
    Date of Patent: January 14, 1992
    Assignee: Kyowa Hakko Kabushiki Kaisha
    Inventors: Shinichiro Toki, Mika Nozawa, Mayumi Yoshida, Hiroshi Sano, Katsuhiko Ando, Isao Kawamoto, Yuzuru Matsuda, Junichi Ikeda, Kazuhiro Kubo
  • DC115A compounds produced by streptomyces sp.
    Patent number: 5066817
    Abstract: Disclosed are DC115A compounds represented by the following general formula: ##STR1## wherein R represents ethyl, propyl or 1-propenyl, and which have antibacterial and anti-tumor activity. DC115A compounds are produced by culturing a microorganism belonging to the genus Streptomyces.
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: November 19, 1991
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Hirofumi Nakano, Mitsunobu Hara, Tsuyoshi Mokudai, Isao Kawamoto, Mayumi Yoshida, Eiji Kobayashi
  • UCN-1028A and UCN-1028C and process for the production thereof
    Patent number: 4992570
    Abstract: UCN-1028A and UCN-1028C having an anti-tumor activity and a protein kinase C inhibitory activity are produced by culturing a microorganism belonging to the genus Cladosporium.
    Type: Grant
    Filed: March 24, 1988
    Date of Patent: February 12, 1991
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Hirofumi Nakano, Eiji Kobayashi, Isami Takahashi, Katsuhiko Ando, Mayumi Yoshida, Shiro Akinaga, Takao Iida