Abstract: Apparatus for information transfer and including a dielectric element having generally opposite first and second surfaces, an information bearing voltage signal being associated with the first surface and an information bearing charge pattern being associated with the second surface, device for applying a flow of charges to the second surface, the flow of charges being operative to transfer information between the first and second surfaces.

Abstract: A three dimensional modeling system comprising apparatus for providing coordinate information with respect to a three-dimensional element and apparatus responsive to the coordinate information by providing a three-dimensional physical model of the three-dimensional element by sequentially solidifying a plurality of layers of a first material. The system includes apparatus for adding to each layer of said first material, prior to solidification of a subsequent layer of the first material thereover, a second material.

Abstract: A three dimensional modelling system comprising means for providing coordinate information with respect to a three-dimensional element and means responsive to said coordinate information by providing a three-dimensional physical model of said three-dimensional element by sequentially solidifying a plurality of layers of a first material and including means for adding to each layer of said first material, prior to solidification of a subsequent layer of the first material thereover, a second material.

Abstract: A system responsive to coordinate information for automatically providing a three-dimensional physical model of a desired geometry and comprising apparatus for selectably solidifying a solidifiable material on a sequential layer by layer basis characterized in that following selectable solidification of a given layer, the non-solidified portions thereof are removed and replaced by a removable support material which is not solidifiable under the same conditions as the solidifiable material.

Abstract: A system for volumetric digitization of three dimensional objects including apparatus for filling any cavities in a three dimensional object and volumes on the outside of the object with a generally opaque support material and solidifying the support material to a solid block having generally uniform hardness before digitizing is undertaken, apparatus for digitizing a first exposed surface of the object, apparatus operative following digitizing of the first exposed surface for removing a layer of predetermined thickness of the object to expose a second exposed surface and apparatus operative to digitize the second exposed surface of the object.

Abstract: A system responsive to coordinate information for automatically providing a three-dimensional physical model of a desired geometry and comprising apparatus for selectably solidifying a solidifiable material on a sequential layer by layer basis characterized in that following selectable solidification of a given layer, the non-solidified portions thereof are removed and replaced by a removable support material which is not solidifiable under the same conditions as the solidifiable material.

Abstract: Three dimensional mapping and modelling apparatus comprising apparatus for providing coordinate information with respect to a three-dimensional element, workstation apparatus arranged to receive the coordinate information from the providing apparatus and to permit manipulation of the coordinate information, and apparatus responsive to manipulated coordinate information for automatically providing a three-dimensional model of a desired three-dimensional element.