Patents by Inventor Nobuaki Matsushita

Nobuaki Matsushita 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).

  • Polyurethane hydrogel and method for the production of the same
    Patent number: 4118354
    Abstract: The improved polyurethane hydrogel is produced by dispersing a reaction product obtained by the reaction of a polyisocyanate having at least two isocyanate groups with a polyether. The polyether comprises a plurality of alkylene oxides, 50 to 90% by weight of which is ethylene oxide, added at random to a polyalcohol having at least two terminal hydroxyl groups in an amount of an average molecular weight within the range of 1,000 to 4,000 per said hydroxyl terminal group of said polyalcohol. The improved polyurethane hydrogel can have a greater water content and is highly stable and highly elastic.
    Type: Grant
    Filed: August 17, 1976
    Date of Patent: October 3, 1978
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Hideo Harada, Nobuaki Matsushita