Patents Assigned to Tanazawa Hakko Sha Co., Ltd.
  • Patent number: 4919388
    Abstract: A plastics shaping mold comprising a layer of hardened resin material fixedly superposed on a metal mold and defining an uneven shaping surface for forming an uneven surface pattern on plastic articles. The plastics shaping mold is prepared by a method comprising the steps of superposing a resin material in a fluid state on a master in sheet form defining an uneven surface inverse to the uneven shaping surface to be formed, allowing the resin material to harden and removing the master, thereby to form the layer of hardened resin material defining the uneven shaping surface.
    Type: Grant
    Filed: September 21, 1988
    Date of Patent: April 24, 1990
    Assignee: Tanazawa Hakko Sha Co., Ltd.
    Inventors: Hiroyuki Koike, Yukihiro Hata, Mitsushi Sogabe