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:
Nov. 30, 2004
Filed:
Sep. 14, 2001
Louay Eldada, Acton, MA (US);
James T. Yardley, Morristown, NJ (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
The invention relates to lithographically formed, tapered waveguides connectable to optical fibers. A tapered waveguide is formed by imagewise exposing, in an oxygen containing atmosohere, and developing a lithographic composition on a substrate. Exposure is conducted by a converging beam of laser light which has a greater intensity a the bottom surface of the coating composition, a lesser intensity at the top surface, and a gradually decreasing intensity from the bottom surface to the top surface of the coating composition. Either the substrate is moved with respect to the converging beam, or the converging beam is moved with respect to the substrate along a linear path. Either the moving is done at a gradually increasing or gradually decreasing velocity or one gradually increases or decreases the intensity of the beam of laser light along the substrate. After developing and removing the non-polyrnerized portion of the coating composition, a tapered waveguide is fornnd on the substrate. The tapered waveguide may be attached to an optical fiber.