Patents by Inventor David E. Snead

David E. Snead 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).

  • Boolean layer comparison slice
    Patent number: 6333741
    Abstract: A method of and apparatus for slicing a three-dimensional object representation into a plurality of layer representations is described, wherein the layer representations are subsequently used to form the object layer-by-layer according to the principles of stereolithography. If not already provided in the object representation, a plurality of layer boundary representations are first formed, and then the boolean difference of successive layer boundary representations are computed to derive boundaries of up and down-facing regions, enabling different cure parameters to be specified for these different regions.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: December 25, 2001
    Assignee: 3D Systems, Inc.
    Inventors: David E. Snead, Dennis R. Smalley, Adam L. Cohen, Joseph W. Allison, Thomas J. Vorgitch, Thomas P. Chen
  • Boolean layer comparison slice
    Patent number: 5854748
    Abstract: A method of and apparatus for slicing a three-dimensional object representation into a plurality of layer representations is described, wherein the layer representations are subsequently used to form the object layer-by-layer according to the principles of stereolithography. If not already provided in the object representation, a plurality of layer boundary representations are first formed, and then the boolean difference of successive layer boundary representations are computed to derive boundaries of up and down-facing regions, enabling different cure parameters to be specified for these different regions.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 29, 1998
    Assignee: 3D Systems, Inc.
    Inventors: David E. Snead, Dennis R. Smalley, Adam L. Cohen, Joseph W. Allison, Thomas J. Vorgitch, Thomas P. Chen
  • Boolean layer comparison slice
    Patent number: 5481470
    Abstract: A method of and apparatus for slicing a three-dimensional object representation into a plurality of layer representations is described, wherein the layer representations are subsequently used to form the object layer-by-layer according to the principles of stereolithography. If not already provided in the object representation, a plurality of layer boundary representations are first formed, and then the boolean difference of successive layer boundary representations are computed to derive boundaries of up and down-facing regions, enabling different cure parameters to be specified for these different regions.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: January 2, 1996
    Assignee: 3D Systems, Inc.
    Inventors: David E. Snead, Dennis R. Smalley, Adam L. Cohen, Joseph W. Allison, Thomas J. Vorgitch, Thomas P. Chen
  • Boolean layer comparison slice
    Patent number: 5321622
    Abstract: A method of and apparatus for slicing a three-dimensional object representation into a plurality of layer representations is described, wherein the layer representations are subsequently used to form the object layer-by-layer according to the principles of stereolithography. If not already provided in the object representation, a plurality of layer boundary representations are first formed, and then the boolean difference of successive layer boundary representations are computed to derive boundaries of up and down-facing regions, enabling different cure parameters to be specified for these different regions.
    Type: Grant
    Filed: October 30, 1990
    Date of Patent: June 14, 1994
    Assignee: 3D Systems, Inc.
    Inventors: David E. Snead, Dennis R. Smalley, Adam L. Cohen, Joseph W. Allison, Thomas J. Vorgitch, Thomas P. Chen