Patents by Inventor Yuji Douzaki

Yuji Douzaki 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).

  • Patent number: 5215601
    Abstract: An additive contains a silicone resin as a deactivation agent which functions at soldering temperature. This novel additive is used for fluxes and soldering pastes. In the course of soldering, the silicone resin in the additive deactivates an activator such as organic acids contained in the flux and the soldering paste in order for removal of an oxide film from a metallic base used for electric circuit. By use of the additive, corrosion of the metallic base with the activator is protected even though the activator remains on the base. The additive enables to omit an unnecessary washing step from a preparation of electric circiut.
    Type: Grant
    Filed: April 15, 1992
    Date of Patent: June 1, 1993
    Assignee: Yuho Chemicals Inc.
    Inventors: Tadashi Gomi, Yuji Douzaki