Patents by Inventor Huei-Yin Cheng

Huei-Yin Cheng 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: 6685820
    Abstract: The present invention relates to a method for treating spent tin or tin/lead stripping solution used in the electronic industry, particularly in the manufacture of printed circuit boards or a lead frames. Said method comprises (i) electrolytically reducing copper ions in the solution to copper at a low temperature; (ii) electrolytically oxidizing Sn2+ and Pb2+ in the solution at a high temperature to form solid tin and lead oxides and hydroxides; (iii) separating solid tin and lead oxides and hydroxides from the solution; (iv) dissolving tin and lead oxides and hydroxides obtained in step (iii) in a strong alkali or acidic solution; and (v) electrolytically reducing the alkali or acidic solution obtained in step (iv) at a high temperature to recover metallic tin and lead. Also, the filtrate obtained in step (iii) above is useful for preparing fresh tin or tin/lead stripping solution.
    Type: Grant
    Filed: April 26, 2002
    Date of Patent: February 3, 2004
    Assignees: Amia Co., Ltd., Persee Chemical Co., Ltd.
    Inventors: Kuo-Chin Chen, Ching-Hwa Chang, Yu-Feng Lin, Tai-Sheng Yuan, Hung-Ming Wang, Jenn-Fang Wu, Huei-Yin Cheng
  • Publication number: 20030200838
    Abstract: The present invention relates to a method for treating spent tin or tin/lead stripping solution used in the electronic industry, particularly in the manufacture of printed circuit boards or a lead frames. Said method comprises (i) electrolytically reducing copper ions in the solution to copper at a low temperature; (ii) electrolytically oxidizing Sn2+ and Pb2+ in the solution at a high temperature to form solid tin and lead oxides and hydroxides; (iii) separating solid tin and lead oxides and hydroxides from the solution; (iv) dissolving tin and lead oxides and hydroxides obtained in step (iii) in a strong alkali or acidic solution; and (v) electrolytically reducing the alkali or acidic solution obtained in step (iv) at a high temperature to recover metallic tin and lead. Also, the filtrate obtained in step (iii) above is useful for preparing fresh tin or tin/lead stripping solution.
    Type: Application
    Filed: April 26, 2002
    Publication date: October 30, 2003
    Inventors: Kuo-Chin Chen, Ching-Hwa Chang, Yu-Feng Lin, Tai-Sheng Yuan, Hung-Ming Wang, Jenn-Fang Wu, Huei-Yin Cheng