Patents by Inventor Yasunaga Iwasaki

Yasunaga Iwasaki 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).

  • Furobenzopyran derivatives, process for preparation of same and herbicides containing same as active components
    Patent number: 5530146
    Abstract: Furobenzopyran derivatives of the general formula (I): ##STR1## in which R.sup.1 is a lower alkyl group, R.sup.2 is a lower alkyl group, lower alkoxy group, halogen atom or lower alkyl group substituted by a halogen atom, R.sup.3 is a lower alkyl group, lower alkoxy group, halogen atom, lower alkyl group substituted by a halogen atom, phenoxy group or benzyloxy group, R.sup.4 is a hydrogen atom or lower alkyl group and m and n are any integers between 0 and 4, have an excellent herbicidal activity on weeds and are completely selective to crops such as paddy rice, soybeans and cotton.
    Type: Grant
    Filed: June 22, 1994
    Date of Patent: June 25, 1996
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Kiyoshi Arai, Masayuki Ooka, Fumiaki Koizumi, Sadafumi Koda, Yasunaga Iwasaki, Yoshiro Kanemoto
  • 3-pyrroline-2-one derivatives and herbicidal compositions containing same
    Patent number: 5409886
    Abstract: A herbicidal composition is here disclosed which exerts an excellent herbicidal activity and which is harmless to paddy rice.A 1-[1-methyl-1-(substituted phenyl)ethyl]-4,5-dimethyl-3-(substituted phenyl)-3-pyrroline-2-one derivative represented by the formula (I) ##STR1## (wherein X is a chlorine atom, fluorine atom or bromine atom; Y is a hydrogen atom, fluorine atom, chlorine atom or methoxy group; Z is a hydrogen atom, fluorine atom, bromine atom or chlorine atom; and Q is a hydrogen atom or fluorine atom)is a novel compound, and the herbicidal composition containing this compound as a herbicidally active ingredient has the strong activity and high selectivity as the herbicidal composition for paddy fields.
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: April 25, 1995
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Koichi Moriyasu, Hideyuki Akieda, Harumichi Aoki, Makoto Suzuki, Shingo Matsuo, Yasunaga Iwasaki, Sadafumi Koda, Kanji Tomiya
  • Furobenzopyran derivatives, process for preparation of same and herbicides containing same as active components
    Patent number: 5356866
    Abstract: Furobenzopyran derivatives of the general formula (I): ##STR1## in which R.sup.1 is a lower alkyl group, R.sup.2 is a lower alkyl group, lower alkoxy group, halogen atom or lower alkyl group substituted by a halogen atom, R.sup.3 is a lower alkyl group, lower alkoxy group, halogen atom, lower alkyl group substituted by a halogen atom, phenoxy group or benzyloxy group, R.sup.4 is a hydrogen atom or lower alkyl group and m and n are any integers between 0 and 4, have an excellent herbicidal activity on weeds and are completely selective to crops such as paddy rice, soybeans and cotton.
    Type: Grant
    Filed: May 24, 1993
    Date of Patent: October 18, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Kiyoshi Arai, Masayuki Ooka, Fumiaki Koizumi, Sadafumi Koda, Yasunaga Iwasaki, Yoshiro Kanemoto
  • 3-azabicyclo[3.1.0]hexane-2-one derivatives and herbicidal compositions containing them as herbicidally active ingredients
    Patent number: 5352655
    Abstract: A 3-azabicyclo[3.1.0]hexane-2-one derivative represented by the following formula (I), and a herbicidal composition containing the same as a herbicidally active ingredient: ##STR1## (wherein X is a halogen atom, an alkyl group having 1 to 3 carbon atoms, an alkoxy group having 1 to 3 carbon atoms or a haloalkyl group having 1 to 3 carbon atoms; Y is a halogen atom or an alkyl group having 1 to 3 carbon atoms; R.sub.1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; R.sub.2 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; m is an integer of 0 to 3; n is an integer of 0 to 2; and when m is 2 or 3, the groups represented by X may be identical or different, and when n is 2, the groups represented by Y may be identical or different).
    Type: Grant
    Filed: December 6, 1993
    Date of Patent: October 4, 1994
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Koichi Moriyasu, Kanji Tomiya, Hideyuki Akieda, Harumichi Aoki, Makoto Suzuki, Yasunaga Iwasaki, Sadafumi Koda
  • Benzaldehyde acetal compounds, preparation process thereof, and herbicidal compositions containing the same as active ingredients
    Patent number: 5178662
    Abstract: Benzaldehyde acetal compounds represented by the following formula: ##STR1## in which each R is a C.sub.3-8 alkyl group and forms an ether bond with the corresponding oxygen atom of the orthoaldehyde moiety have no injury to crops and, moreover, exhibits superb herbicidal effects owing to the limitation of the number of carbon atoms of each alkyl group to 3-8.
    Type: Grant
    Filed: December 16, 1991
    Date of Patent: January 12, 1993
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Tsutomu Ishii, Katsutoshi Ishikawa, Sunao Maeda, Masatoshi Gohbara, Yasunaga Iwasaki, Makoto Nishida, Sadafumi Koda
  • Pyridyloxypyrimidine derivatives, preparation process thereof, and herbicidal compositions containing the same as active ingredients
    Patent number: 5129937
    Abstract: Herbicidally active pyridyloxypyrimidines represented by the following formula [I]: ##STR1## wherein R means a formyl group or an acetal group represented by ##STR2## R.sup.1 and R.sup.2 being the same or different and individually denoting an alkyl group having 1-4 carbon atoms or R.sup.1 and R.sup.2 being coupled together and denoting an alkylene group, R.sup.3, having 2-3 carbon atoms; are prepared by reacting 2 formyl-3-hydroxypyridine or 3-hydroxy-2-pyridine carboxaldehyde acetal with 2 halogeno-4,6 dimethoxypyrimidine in the presence of a base.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: July 14, 1992
    Assignee: Mitsui Toatsu Chemicals Incorporated
    Inventors: Tsutomu Ishii, Katsutoshi Ishikawa, Masatoshi Gohbara, Yasunaga Iwasaki, Makoto Nishida