Patents by Inventor Yozo Ohtsuka

Yozo Ohtsuka 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).

  • Process for producing 4-carboxamido-5-cyano-2-imidazolone
    Patent number: 4128719
    Abstract: A process for producing 4-carboxamido-5-cyano-2-imidazolone which comprises reacting diaminomaleonitrile with carbon dioxide in a polar solvent, optionally in the presence of a basic catalyst.
    Type: Grant
    Filed: December 16, 1977
    Date of Patent: December 5, 1978
    Assignee: Sagami Chemical Research Center
    Inventors: Takakazu Kojima, Yozo Ohtsuka
  • Process for producing 4-carboxamido-5-cyano-2-imidazolone
    Patent number: 4093810
    Abstract: A process for producing 4-carboxamido-5-cyano-2-imidazolone which comprises reacting diaminomaleonitrile with carbon dioxide in a polar solvent, optionally in the presence of a basic catalyst.
    Type: Grant
    Filed: July 26, 1976
    Date of Patent: June 6, 1978
    Assignee: Sagami Chemical Research Center
    Inventors: Takakazu Kojima, Yozo Ohtsuka
  • Diaminomaleonitrile derivatives and processes for preparing the same
    Patent number: 4017533
    Abstract: N-.alpha.-Cyanoalkyl compounds of diaminomaleonitrile represented by the formula (I) ##STR1## wherein R represents a straight or branched chain alkyl group having 1 to 4 carbon atoms or a phenyl group useful for producing dihydropyrazine compounds; iminonitrile compounds of diaminomaleonitrile useful as antimicrobial agents and intermediates, represented by the formula (II) ##STR2## wherein R is as defined above; and processes for preparing the same.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: April 12, 1977
    Assignee: Sagami Chemical Research Center
    Inventor: Yozo Ohtsuka
  • Ketimine derivatives and process for producing the same
    Patent number: 3998836
    Abstract: Novel Schiff bases, ketimine derivatives, represented by the formula ##STR1## wherein R.sup.1 and R.sup.2 are as defined hereinafter, which possess a wide variety of utilities, and the process for producing the above ketimine derivatives from diaminomaleonitrile and a wide variety of aromatic .alpha.-ketones.
    Type: Grant
    Filed: August 12, 1974
    Date of Patent: December 21, 1976
    Assignee: Sagami Chemical Research Center
    Inventor: Yozo Ohtsuka