Patents by Inventor Nobuyuki Ohsako

Nobuyuki Ohsako 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).

  • Polyether having heterofunctional groups at both ends, process for the preparation thereof and polymerization initiator therefor
    Patent number: 5679765
    Abstract: The present invention relates to a bifunctional polyether having groups different from each other at both ends, with a polymerization degree of 5 to 10000 and consisting of repeating units each represented by the following formula (I): ##STR1## (wherein R.sub.1, represents a hydrogen atom, halogen atom, or a lower alkyl group optionally substituted by a halogen atom, and R.sub.1 in each repeating unit may be the same or different), as well as to a process for the preparation thereof and a polymerization initiator therefor. The process of production and polymerization initiator of the present invention enable 100% introduction of a primary amino group into one of the ends of polyether.
    Type: Grant
    Filed: July 16, 1996
    Date of Patent: October 21, 1997
    Assignee: Research Development Corporation of Japan
    Inventors: Yasuhisa Sakurai, Teruo Okano, Masayuki Yokoyama, Kazunori Kataoka, Yukio Nagasaki, Nobuyuki Ohsako, Masao Kato
  • Polyether having heterofunctional groups at both ends, process for the preparation thereof and polymerization initiator therefor
    Patent number: 5483008
    Abstract: The present invention relates to a bifunctional polyether having groups different from each other at both ends, with a polymerization degree of 5 to 10000 and consisting of repeating units each represented by the following formula (I): ##STR1## (wherein R.sub.1, represents a hydrogen atom, halogen atom, or a lower alkyl group optionally substituted by a halogen atom, and R.sub.1 in each repeating unit may be the same or different), as well as to a process for the preparation thereof and a polymerization initiator therefor. The process of production and polymerization initiator of the present invention enable 100% introduction of a primary amino group into one of the ends of polyether.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: January 9, 1996
    Assignee: Research Development Corporation of Japan
    Inventors: Yasuhisa Sakurai, Teruo Okano, Masayuki Yokoyama, Kazunori Kataoka, Yukio Nagasaki, Nobuyuki Ohsako, Masao Kato