Production of three-dimensional objects

Abstract

A method for producing a three-dimensional object having selected elements which are colored a different color than the color of other elements of the object, comprising the steps of: a. providing a film of a photohardenable composition containing a photoresponsive agent, b. irradiating the film in a cross-sectional pattern of the object to be formed so as to form hardened areas in the film. c. selectively irradiating one or more portions of the cross-sectional pattern corresponding to the selected elements which are desired to be colored a different color than the color of other elements of the object with radiation which activates the photoresponsive agent, the photoresponsive agent thereby producing color in or removing color from the selectively irradiated portions of the cross-sectional pattern, the steps being performed with radiation of a different wavelength than the radiation used in performing step b, d. repeating steps a, b and c to form successive adjacent cross-sectional patterns of the object, and e. integrating the cross-sectional patterns to provide the three-dimensional object.

Dependencies are inferred from the claim text.