Patents by Inventor Chikara Ieda

Chikara Ieda 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).

  • Azaazulene compounds which are useful as antiallergic and antiinflammatory agents
    Patent number: 5013736
    Abstract: An azaazulene derivative having the general formula (I): ##STR1## wherein R.sup.1 is hydrogen atom or isopropyl group; the bond C N between C at the 2-position and N at the 1-position is single bond or double bond; when the bond C N is single bond, R.sup.2 is 5-tetrazolyl group, R.sup.3 is taken together with carbon atom to form carbonyl group at the 2-position, and R.sup.4 is hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a lower alkenyl group, a lower alkyl group having oxygen atom or sulfur atom in carbon chain, a lower alkyl group having a halogen atom or cyano group, a lower alkyl group having heteroaromatic ring, a diphenyl lower alkyl group, or a lower alkyl group having hydrocarbon-aromatic ring with the general formula: ##STR2## in which W is single bond or carbonyl group, oxygen atom, sulfur atom or --CH.dbd.CH--, n is an integer of 1 to 6, and R.sup.1', R.sup.2' and R.sup.
    Type: Grant
    Filed: December 26, 1989
    Date of Patent: May 7, 1991
    Assignee: Kaken Pharmaceutical Co., Ltd.
    Inventors: Michiko Nagahara, Chikara Ieda, Mitsuo Mimura, Katsuhiro Uchida, Soichiro Sato, Makoto Okumura
  • Azaazulene compounds which are useful as antiallergic and antiinflammatory agents
    Patent number: RE34918
    Abstract: An azaazulene derivative having the general formula (I): ##STR1## wherein R.sup.1 is hydrogen atom or isopropyl group; the bond C N between C at the 2-position and N at the 1-position is single bond or double bond; when the bond C N is single bond, R.sup.2 is 5-tetrazolyl group, R.sup.3 is taken together with carbon atom to form carbonyl group at the 2-position, and R.sup.4 is hydrogen atom, an alkyl group having 1 to 18 carbon atoms, a lower alkenyl group, a lower alkyl group having oxygen atom or sulfur atom in carbon chain, a lower alkyl group having a halogen atom or cyano group, a lower alkyl group having heteroaromatic ring, a diphenyl lower alkyl group, or a lower alkyl group having hydrocarbon-aromatic ring with the general formula: ##STR2## in which W is single bond or carbonyl group, oxygen atom, sulfur atom or --CH.dbd.CH--, n is an integer of 1 to 6, and R.sup.1', R.sup.2' and R.sup.
    Type: Grant
    Filed: April 5, 1994
    Date of Patent: April 25, 1995
    Assignee: Kaken Pharmaceutical Co., Ltd.
    Inventors: Michiko Nagahara, Chikara Ieda, Mitsuo Mimura, Katsuhiro Uchida, Soichiro Sato, Makoto Okumura