Patent Document ID: 5514519
Application ID: 08224503
Patent Status: 1

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