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. 09, 1982
Filed:
Jul. 24, 1980
Suresh T Gulati, Elmira, NY (US);
George W Scherer, Painted Post, NY (US);
Corning Glass Works, Corning, NY (US);
Abstract
In the method of making a preform for a high numerical aperture gradient index optical waveguide, the concentration of two dopant constituents is changed during fabrication. Concentration of the first dopant, GeO.sub.2, is changed radially as the preform is built up in order to produce the desired radial refractive index gradient. The concentration of the second dopant, B.sub.2 O.sub.3, is changed radially to compensate for the radial change in thermal expansion coefficient caused by the varying GeO.sub.2 concentration. B.sub.2 O.sub.3 is added to the cladding layer to make the thermal expansion coefficient of the cladding equal to or greater than the composite thermal expansion coefficient of the core. The magnitude of residual tension at the inner surface caused by thermal expansion gradients is reduced and premature cracking of the preform is eliminated.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile