Patents & Trademarks

Patented in Japan

KATSUYOSHI SHIMADA holds Japanese Patent No. 7703264 for THE WRIST RESEARCH METHOD—an original method for designing the inner curve of a bangle. 

  • Bangle Inner Curve Design Method

  • Japanese Patent No. 7703264
    View the patent record

  • Developed through years of observing differences in wrist anatomy, proportion and movement, the method allows each bangle to be shaped around the individual rather than a standard oval. The exterior remains quiet and sculptural while the inner curve is refined in precise increments for the wearer.

    Patented in Japan under Patent No. 7703264. Patent applications have also been filed in Europe. 

Registered Trademarks

“KATSUYOSHI SHIMADA”, “手首の研究家” (Wrist Researcher) and “BITTER GOLD” are registered trademarks in Japan.

  • KATSUYOSHI SHIMADA

  • Registration No. 7091165

  • Jewellery shaped to sit naturally on the body and quietly complement the individuality of its wearer. KATSUYOSHI SHIMADA is registered in Japan as the brand name through which this approach to craftsmanship is expressed.

  • Wrist Researcher

  • 登録番号｜第6682136号

  • Every wrist differs in its bone structure, tendon placement and thickness. Close observation of these differences guides the search for a natural harmony between jewellery and the body.

    “手首の研究家”, meaning “Wrist Researcher”, is registered in Japan as a name that expresses this approach.

  • BITTER GOLD

  • Registration No. 6861972

  • A distinctive grey tone with the depth of layered hues, developed from a gold base. Its subtle character shifts with the angle of the light and the tone of the skin.

    BITTER GOLD is registered in Japan as the name of this original colour.