Patents by Inventor Michihisa Osawa

Michihisa Osawa 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).

  • Novel expandable particles of a styrene polymer and process for preparing the same
    Patent number: 4238570
    Abstract: Expandable particles of a styrene polymer which comprise on the surface thereof an ester of an aliphatic carboxylic acid with an aliphatic alcohol, the ester having no hydroxyl group in the molecule and being a solid at room temperature, or a mixture of said ester and a finely divided lubricant, and a process for preparing the same.
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: December 9, 1980
    Assignee: Hitachi Chemical Company, Ltd.
    Inventors: Hideaki Shibata, Michihisa Osawa