Patents by Inventor Takahisa Hayashida

Takahisa Hayashida 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).

  • Polyoxyethylene derivatives having optionally protected amino group at one end and process for producing the same
    Patent number: 6388041
    Abstract: Disclosed are polyoxyethylene derivatives having different functional groups at both ends of the molecule represented by the following formula (I) and a process for producing the derivatives by anionic living polymerization. The present invention provides polymers which are especially suitable for use as medical materials. wherein A′ and B′ are organosilyl type amino-protecting groups, R is a hydrogen atom or a C1-6 alkyl group, and Y is a hydrogen atom, an alkali metal or a certain functional group.
    Type: Grant
    Filed: November 7, 2000
    Date of Patent: May 14, 2002
    Assignee: Nano Carrier Co Ltd
    Inventors: Kazunori Kataoka, Masao Kato, Yukio Nagasaki, Takahisa Hayashida, Michihiro Iijima, Teruo Okano