Patents by Inventor Kazuto Shiraishi

Kazuto Shiraishi 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).

  • Polysulfone separation membrane
    Patent number: 5049169
    Abstract: A separation membrane comprising a soluble aromatic polysulfone having the formula --(X--Y)--, wherein X and Y comprise the constituent unit shown below, and the inherent viscosity (.eta..sub.inh) based on the value of a solution of 0.5 g of the polysulfone dissolved in 100 ml of N-methyl-2-pyrrolidone measured at 30.degree. C. is 0.4 or more: ##STR1## wherein R.sub.1 -R.sub.4 are each either H, CH.sub.3 or C.sub.2 H.sub.5, and R.sub.5 -R.sub.6 are each either H, Cl, or NO.sub.2.
    Type: Grant
    Filed: May 22, 1990
    Date of Patent: September 17, 1991
    Assignees: Nippon Steel Corporation, Nippon Steel Chemical Co., Ltd.
    Inventors: Takerou Teramoto, Shingo Kazama, Tsutomu Kaneta, Masao Sakashita, Masaya Furukawa, Kazuto Shiraishi