Patent ID: 6113780
Filing Date: 2000-09-05
Classification: B01D

Abstract:
In a laser-powered apparatus for forming three dimensional objects by irradiation of a liquid resin, the combination comprising:an upstanding vat adapted to contain the liquid resin; said vat comprising a flat planar bottom wall, and vertical side walls extending upwardly from said bottom wall; said vertical side walls having upper edges located above a plane of said bottom wall; anda liftable platform means removably disposed in said vat for removing resinous sludge that accumulates over time in the vat; said platform means comprising a frame adapted to rest on the vat bottom wall, a planar strainer screen having peripheral edge areas anchored to said frame, two lifter arms extending upwardly from said frame normal to the plane of the strainer; and a handle connected to each lifter arm; each handle being located outside the vat near the upper edge of an associated vat vertical side wall.