Patents by Inventor Hideki Suigihara

Hideki Suigihara 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).

  • Method of selectively separating lead ions
    Patent number: 5411667
    Abstract: A method of selectively separating lead ions from metal ions-containing aqueous liquid by contact with a solution containing a polyether derivative dissolved in a water-insoluble organic solvent and serving as an ionophore or carrier for lead ions. The polyether derivative is a compound expressed by the general formula: ##STR1## wherein R.sub.1 and R.sub.2 stand independently from each other for a hydrogen atom or an alkyl group and n is an integer of 2 or 3.
    Type: Grant
    Filed: August 3, 1994
    Date of Patent: May 2, 1995
    Assignee: Director-General of Agency of Industrial Science and Technology
    Inventors: Kazuhisa Hiratani, Hideki Suigihara, Kazuyuki Kasuga