Patents by Inventor Hiroshi Toriya

Hiroshi Toriya 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).

  • Generation of free-form surface model by reversible rounding operation
    Patent number: 6867769
    Abstract: A method of generating a free-form surface model includes the steps of applying linear transformation to a lattice polygon model to generate vertices of a free-form surface model corresponding to respective vertices of the lattice polygon model, and generating control points of cubic Bezier curves that connect the vertices of the free-form surface model, and that correspond to respective edges of the lattice polygon model.
    Type: Grant
    Filed: March 16, 2000
    Date of Patent: March 15, 2005
    Assignees: Ricoh Company, Ltd., Lattice Technology, Inc.
    Inventors: Hiroshi Toriya, Tsuyoshi Harada, Makoto Yajima, Akira Wakita
  • Solid modeling method
    Patent number: 5179644
    Abstract: A solid modeling method for modeling solids which include free-form surfaces calculates intersecting portions of two solids and storing calculated results as first data, stores free-form shapes of the two solids as second data, approximates free-form surface portions of the two solids by polyhedrons so as to describe the two solids in a form of polyhedrons, obtains a union, a difference or an intersection of the two solids by carrying out set operations on the polyhedrons, and returns the polyhedrons obtained by the set operations into solids including free-form surfaces based on the stored first and second data.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: January 12, 1993
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroaki Chiyokura, Teiji Takamura, Hiroshi Toriya, Toshiaki Sato