Patents Assigned to Taisei Dental Mfg. Co., Ltd.
  • Dental investing material
    Patent number: 5820662
    Abstract: A dental investing material is disclosed which comprises a combination of: (a) quartz and/or cristobalite, (b) a phosphate binder, and (c) aluminous cement, wherein said dental investing material is further added with tridymite and magnesium silicate. The disclosed dental investing material shows minimized expansion during hardening, significant expansion during heating and develops no cracks when heated at a conventional heating rate.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: October 13, 1998
    Assignee: Taisei Dental Mfg. Co., Ltd.
    Inventors: Fuminobu Kubo, Kazuhiko Johshin
  • Dental refractory model materials
    Patent number: 5298200
    Abstract: A dental refractory model material comprises as powdery components 5 to 20% by weight of a soluble phosphate, 5 to 20% by weight of magnesium oxide and 10 to 50% by weight of at least one selected from the group of alumina, zirconia, fused quartz, mullite, spinel and cordierite with the balance being crystalline quartz and crystobalite. The refractory model material also includes a liquid component such as a colloidal silica dispersion.
    Type: Grant
    Filed: June 15, 1993
    Date of Patent: March 29, 1994
    Assignees: G-C Dental Industrial Corp., Taisei Dental Mfg. Co., Ltd.
    Inventors: Fuminobu Kubo, Hiroyuki Hino, Tsutomu Shibata