Patents by Inventor Kyosuke Kitoh

Kyosuke Kitoh 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).

  • 7.alpha.-Methoxycephalosporin derivatives, and antibacterial drugs containing the same
    Patent number: 4415567
    Abstract: Novel 7.alpha.-methoxycephalosporin derivatives, their pharmaceutically acceptable salts, process for the preparation thereof, and antibacterial drugs involving the derivative or salt. The derivatives or salts are effective against the Gram-positive bacteria and the Gram-negative bacteria.
    Type: Grant
    Filed: February 18, 1982
    Date of Patent: November 15, 1983
    Assignee: Eisai Co., Ltd.
    Inventors: Yoshimasa Machida, Isao Saito, Seiichiro Nomoto, Shigeto Negi, Hironori Ikuta, Kyosuke Kitoh
  • 7-.alpha.-methoxycephalosporin derivatives, and antibacterial drugs onctaining the same
    Patent number: 4344944
    Abstract: Novel 7.alpha.-methoxycephalosporin derivatives, their pharmaceutically acceptable salts, process for the preparation thereof, and antibacterial drugs involving the derivative or salt. The derivatives or salts are effective against the Gram-positive bacteria and the Gram-negative bacteria.
    Type: Grant
    Filed: December 29, 1980
    Date of Patent: August 17, 1982
    Assignee: Eisai Co., Ltd.
    Inventors: Yoshimasa Machida, Isao Saito, Seiichiro Nomoto, Shigeto Negi, Hironori Ikuta, Kyosuke Kitoh
  • Cephalosporin compounds and antibacterial drugs containing the same
    Patent number: 4285941
    Abstract: Novel cephalosporin compounds of the general formula: ##STR1## wherein R.sub.1 represents a substituted or unsubstituted nitrogen-containing heterocyclic-thio group, R.sub.2 represents hydrogen or hydroxy, and R.sub.3, R.sub.4 and R.sub.5 each represents hydrogen, hydroxy or acyloxy, and their salts, and processes for the preparation thereof. The novel compounds and their salts have antibacterial activity.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: August 25, 1981
    Assignee: Eisai Co., Ltd.
    Inventors: Yoshimasa Machida, Isao Saito, Seiichiro Nomoto, Shigeto Negi, Takeo Kanai, Kyosuke Kitoh, Kanemasa Katsu, Yukio Ohya, Takeshi Nagasu
  • Cephalosporin derivatives, and antibacterial drugs comprising said derivatives
    Patent number: 4285940
    Abstract: New cephalosporin derivatives having the general formula: ##STR1## wherein R.sub.1 and R.sub.2 each represents hydroxy or acyloxy and their salts, and processes for the production thereof. The cephalosporin derivatives of the present invention are useful as antibacterial drugs.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: August 25, 1981
    Assignee: Eisai Co., Ltd.
    Inventors: Yoshimasa Machida, Isao Saito, Seiichiro Nomoto, Shigeto Negi, Hironori Ikuta, Kyosuke Kitoh
  • Cephalosporin derivatives, and antibacterial drugs containing the derivatives
    Patent number: 4285939
    Abstract: New cephalosporin derivatives represented by the general formula: ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3 each represents hydroxy, acyloxy, and hydrogen provided that two or three of R.sub.1, R.sub.2, and R.sub.3 are not hydrogen at the same time, and their salts, and processes for the preparation thereof. The cephalosporin derivatives of the present invention are useful as antibacterial drugs.
    Type: Grant
    Filed: April 7, 1980
    Date of Patent: August 25, 1981
    Assignee: Eisai Co., Ltd.
    Inventors: Yoshimasa Machida, Isao Saito, Motosuke Yamanaka, Seiichiro Nomoto, Shigeto Negi, Kyosuke Kitoh, Kanemasa Katsu, Yukio Ohya, Takeshi Suzuki, Kyoko Koizumi