Patents by Inventor Chang Yu Ching

Chang Yu Ching 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).

  • Publication number: 20030089613
    Abstract: The present invention is to provide a method of selective electroplating comprises a substrate. The substrate may include printed circuir board or other plating metal article on printed circuit board surface specified region. Then, a wet film formed on the substrate by screen-printing, wherein the wet film is photo-sensitivty. Next, it is hardening the wet film, and then exposing the wet film. Next, it is developing the wet film to expose some region for forming metal on the substrate. A metal layer formed on the substrate. Finally, it is stripping the wet film.
    Type: Application
    Filed: November 15, 2001
    Publication date: May 15, 2003
    Inventor: Chang Yu Ching