Patents by Inventor Mayumi Date

Mayumi Date 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).

  • Sn-Bi alloy-plating bath and method for forming plated Sn-Bi alloy film
    Patent number: 5759381
    Abstract: An Sn--Bi alloy-plating bath comprises (i) Bi ions, (ii) Sn ions, (iii) ions of one metal selected from the group consisting of Cu, Co and Ag, and (iv) one member selected from the group consisting of carboxylic acids, lactone compounds, alkanesulfonic acids, alkanolsulfonic aicds, phenolsulfonic acids and salts thereof and is substantially free of lead ions. The bath permits the formation of an Sn--Bi alloy-plated film, does not form any plated film having impaired quality even at a temperature higher than about 100.degree. C. and does not form any whisker.
    Type: Grant
    Filed: August 30, 1996
    Date of Patent: June 2, 1998
    Assignee: Dipsol Chemicals Co., Ltd.
    Inventors: Hitoshi Sakurai, Ayumi Saito, Mayumi Date, Osamu Mita