Patents by Inventor Haruhiro Ohtsu

Haruhiro Ohtsu 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).

  • Compounded thermoplasticized isoprene polymer resin for filling a dental root canal, and method of making same
    Patent number: 4483679
    Abstract: The invention is directed to a compounded thermoplasticized gutta percha or balata and isoprene polymer resin, for filling a dental root canal in an efficient and convenient manner, and a method for preparing the same.The compounded resin includes gutta percha or balata and isoprene polymer and compounding materials including paraffin wax, adapted to compound the gutta percha or balata and isoprene polymer such that they plasticize at a relatively low temperature in the range of 40.degree. C. to 60.degree. C. The use of gutta percha or balata and isoprene polymer, and the relatively low plasticizing temperature, enable the compounded resin to be injected into a prepared dental root canal for filling thereof in an efficient and convenient manner.The method for preparing the compounded resin includes combining, heating and mixing gutta percha or balata and isoprene polymer and the compounding materials to a relatively low temperature in the range of 40.degree. C. to 60.degree. C.
    Type: Grant
    Filed: November 30, 1982
    Date of Patent: November 20, 1984
    Assignee: Toyo Chemical Laboratories, Inc.
    Inventors: Mutsuo Fujisawa, Mitsuru Otani, Haruhiro Ohtsu, Tsutomu Kameda