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:
Jul. 03, 2007
Filed:
Jul. 27, 2005
Michael S. Hibbs, Westford, VT (US);
Max G. Levy, Essex Junction, VT (US);
Kenneth C. Racette, Fairfax, VT (US);
Michael S. Hibbs, Westford, VT (US);
Max G. Levy, Essex Junction, VT (US);
Kenneth C. Racette, Fairfax, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In a projection apparatus for projecting optical images, an optical mask support stage having a pair of separated arms. Each arm being provided with a respective mask chucking bar that supports a respective edge of a thin glass mask and applies to the respective edge a bending moment away from the center of the mask to reduce or eliminate any gravitational induced sag in the center of the mask thereby improving the quality of the images projected by the apparatus.