Patents Assigned to Tokyo First Trading Co., Ltd.
  • Flux for solder paste and solder paste
    Patent number: 7241348
    Abstract: A flux for solder paste contains a dicarboxylic acid of carbon number 3 to 5 and a dicarboxylic acid of carbon number 15 to 20 as an activator, which prevents skinning or changes by aging of viscosity. In actual use, the solder paste of the present invention can maintain good coating and printing ability for long time, further can endure preheating under high temperatures.
    Type: Grant
    Filed: January 22, 2003
    Date of Patent: July 10, 2007
    Assignee: Tokyo First Trading Co., Ltd.
    Inventors: Kenichi Wada, Shoichi Nakaji