Patents by Inventor Isamu Katsuyama

Isamu Katsuyama 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).

  • Cembranoids with chemopreventive activity
    Publication number: 20050250752
    Abstract: A cembranoid compound of the following formula (I) as described herein. The compounds of the present invention are useful as chemopreventive and chemotherapeutic agents.
    Type: Application
    Filed: May 9, 2003
    Publication date: November 10, 2005
    Inventors: Jordan Ziawiony, Hesham Fahmy, Isamu Katsuyama, Sherief Khalifa, Takao Konoshima
  • Method for producing 2-methylspiro(1,3-oxathiolane-5,3')quinuclidine
    Patent number: 5571918
    Abstract: A method for producing 2-methylspiro(1,3-oxathiolane-5,3')quinuclidine, which comprises reacting 3-hydroxy-3-mercaptomethylquinuclidine or a salt thereof and a carbonyl compound in the presence of a catalyst made of at least one member selected from the group consisting of tin halides, oxyacids of phosphorus, phosphorus oxyhalides and organic sulfonic acids, to produce cis-form 2-methylspiro(1,3-oxathiolane-5,3')quinuclidine or a salt thereof.
    Type: Grant
    Filed: May 11, 1995
    Date of Patent: November 5, 1996
    Assignee: Ishihara Sangyo Kaisha Ltd.
    Inventors: Koji Hayashi, Sho Tokumoto, Hiroshi Yoshizawa, Tatsuo Isogai, Masaru Kimura, Masahiko Sawaki, Takayoshi Ando, Isamu Katsuyama, Hayato Ariyoshi, Tadashi Nakamura
  • Method for producing dichloromethylpyridines
    Patent number: 5290944
    Abstract: A method for producing a dichloromethylpyridine of the formula (II): ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 which are independent of one another, is a hydrogen atom, a halogen atom, an alkoxy group or a phenoxy group which may be substituted, provided that R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are not simultaneously hydrogen atoms, which comprises reacting a trichloromethylpyridine of the formula (I): ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined above, with a reducing agent, wherein:(1) a dialkyl phosphite or a trialkyl phosphite is used as the reducing agent, and the reaction is conducted in the presence of a basic substance and an alcohol solvent, or(2) a trialkyl phosphine or triphenyl phosphine is used as the reducing agent, and the reaction is conducted in the presence of an alcohol solvent.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: March 1, 1994
    Assignee: Ishihara Sangyo Kaisha Ltd.
    Inventors: Rikuo Nasu, Taku Shimura, Isamu Katsuyama