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. 20, 2004
Filed:
Dec. 20, 2001
James B. Carpenter, Austin, TX (US);
John P. Stedman, Austin, TX (US);
James R. Bylander, Austin, TX (US);
Gordon Wiegand, Austin, TX (US);
Nicholas A. Stacey, Austin, TX (US);
Anthony W. Gatica, Cedar Park, TX (US);
Dale Elder, Austin, TX (US);
James F. Brennan, III, Austin, TX (US);
Bryon J. Cronk, Round Rock, TX (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A method for increasing the photosensitivity of a selected portion of an optical fiber and for producing a grating in the selected portion of an optical fiber. The method includes the step of placing the selected portion of the optical fiber in a hydrogen containing atmosphere. The volume of the hydrogen-containing atmosphere immediately surrounding only the selected portion of the optical fiber is heated to a temperature of at least 250° C. Only the selected portion of the optical fiber is exposed to the heated volume of the hydrogen-containing atmosphere at a temperature of at least 250° C. for a predetermined time.