The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 1992
Filed:
Apr. 17, 1989
Charles W Hull, Santa Clarita, CA (US);
Stuart T Spence, So. Pasadena, CA (US);
Charles W Lewis, Van Nuys, CA (US);
Wayne A Vinson, Valencia, CA (US);
Raymond S Freed, Northridge, CA (US);
Dennis R Smalley, Baldwin Park, CA (US);
3D Systems, Inc., Valencia, CA (US);
Abstract
An improved sterolithography system for generating a three-dimensional object from object defining information, the information defining the object being structurally specified to reduce curl, stress and distortion in the ultimately formed object is described. A stereolithographic distortion known as curl is reduced by the system, and several techniques to eliminate or reduce curl are utilized by the system, including dashed line, bent line, secondary structure, rivets, and multi-pass techniques.