Patents by Inventor Yoshiyuki Harada

Yoshiyuki Harada 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).

  • Organic polymer separation membrane having fluorene skeleton and oxygen enrichment device utilizing same
    Patent number: 4968331
    Abstract: A separation membrane consisting of a polyamide having a unit (I) or a mixing of polyamides having units (I) and (II) and (II') or a polyester having a unit (III) or (IV) and (IV') or a mixture of polyesters having unit (III) and (IV) and (IV'):--HN--X--NH--Z.sub.1 -- (I)--(NN--X--NH--Z.sub.1).sub.l -- (II)--(NN--X--Nh--Z.sub.1 ').sub.n -- (II')--O--X--O--Z.sub.2 -- (III)--(O--X--O--Z.sub.2).sub.r -- (IV)--O--X--O--Z.sub.2 ').sub.s -- (IV')wherein X represents ##STR1## where R represents H, CH.sub.3, or C.sub.2 H.sub.5 ; Z.sub.1 and Z.sub.2 represent ##STR2## Z.sub.1 ' represents --CO--(CH.sub.2).sub.p --CO--, Z.sub.2 ' represents --CO--CH.dbd.CH--CO--, p is an integer of 4 to 8, n/l is 1.0 to 20, and r/s is 0.5 to 100.
    Type: Grant
    Filed: March 13, 1990
    Date of Patent: November 6, 1990
    Assignee: Nippon Steel Corporation
    Inventors: Masao Sakashita, Tetsuo Sakamoto, Shingo Kazama, Yoshiyuki Harada, Takero Teramoto, Kazuhiro Watanabe, Bunji Shimomura, Tsutomu Kaneta