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Method of and apparatus for making a three-dimensional product by stereolithography

  • US 5,174,931 A
  • Filed: 04/27/1990
  • Issued: 12/29/1992
  • Est. Priority Date: 09/26/1988
  • Status: Expired due to Term
First Claim
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1. An apparatus for stereolithographically forming a portion of a three-dimensional object wherein a subsequent layer of the three-dimensional object is formed over a previously formed layer of the object, comprising:

  • a) a vessel for holding a building material having a working surface and the building material selectively physically transformable upon exposure to prescribed synergistic stimulation;

    b) means for forming a uniform coating of desired thickness over the previously formed layer, including;

    a smoothing element having a plurality of substantially separate members on a lower surface thereof;

    means for sweeping the smoothing members over the previously formed layer; and

    c) means for applying a prescribed pattern of synergistic stimulation to the building material at the working surface to form the subsequent layer.

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