Patents by Inventor Hirohisa Ishiguro

Hirohisa Ishiguro 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).

  • Blue colored artificial stone stocks and method of manufacturing the same
    Patent number: 4381348
    Abstract: A low cost beautiful blue colored artificial stone stock is obtained by using a high carbon or low carbon slag formed at the time of preparing ferrochromium, as it is or after incorporated with an expensive addition. The stone stock has a composition of 40-70% by weight of SiO.sub.2, 0.1-5% by weight of a low grade chromium oxide and the balance of CaO, MgO and Al.sub.2 O.sub.3.
    Type: Grant
    Filed: December 28, 1981
    Date of Patent: April 26, 1983
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Toshio Kamatani, Hirohisa Ishiguro, Kensei Itakura, Kazuo Yamagishi