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. 07, 1981
Filed:
Jul. 02, 1979
David A Krohn, Hamden, CT (US);
Eotec Corporation, West Haven, CT (US);
Abstract
A process is disclosed for making an optical fiber having a graded index glass core enveloped by a cladding material. The ingredients from which the core glass is to be formed are dropped into a closed tube of the cladding material which is more refractory than the core glass. The ingredients are melted to form a glassy liquid which is fined within the tube. Fining takes place at a temperature sufficiently high to cause a relatively fast reaction between the core glass and cladding, resulting in a partial mixing of the cladding and core glasses. The mixed glasses have an index of refraction intermediate that of the core and cladding at the interface. The temperature is then elevated further and the tube and glassy liquid drawn into a fiber.