Patents by Inventor Joei Yukawa

Joei Yukawa 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 the production of a silver coated copper powder and conductive coating composition
    Patent number: 4652465
    Abstract: A process for producing a silver coated copper powder, characterized in that a metal silver is precipitated on the surface of a metal copper powder by means of a silver complex solution comprising a silver salt, an ammonium carbonate compound and ammonia water as essential components.
    Type: Grant
    Filed: May 7, 1985
    Date of Patent: March 24, 1987
    Assignee: Nissan Chemical Industries Ltd.
    Inventors: Noriaki Koto, Joei Yukawa, Takeo Moro
  • Epoxy resin and the process for its production
    Patent number: 4448948
    Abstract: An epoxy resin substantially represented by the general formula ##STR1## where Ar.sup.1 is a residual group of a dihydric phenol derived from a compound having one or two benzene nuclei, Ar.sup.2 is residual group of a halogen-substituted benzenoid compound having two halogen atoms on its nuclei and represented by the formula --Ar.sup.3 --Y--Ar.sup.4 -- where each of Ar.sup.3 and Ar.sup.4 is a hydrocarbon group having a divalent benzene nucleus and Y is a sulfone group or a carbonyl group, and n is an integer of from 1 to 50.
    Type: Grant
    Filed: January 14, 1983
    Date of Patent: May 15, 1984
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Kazumi Tsubaki, Hiroshi Morinaga, Joei Yukawa