Patent · US Expired

Method for the production of semiproduct for the production of light conducting fibers

US4235615A · kind A · utility

7Cited by

3References

10Claims

0Family size

Assignee

Heraeus Quarzschmelze GmbH · DE

Inventors

Karlheinz Rau · Hanau, DE
Albert Muhlich · Frankfurt, DE
Fritz Simmat · Gelnhausen, DE
Norbert Treber · Kriftel, DE

Key dates

Filing date	Feb 9, 1979
Grant date	Nov 25, 1980
Priority date	—
Expiry date	Feb 9, 1999

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2933
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A semiproduct for use in the manufacture of light conducting fibers comprising a core of synthetic quartz glass having a thickness of 6 to 400 mm, the quartz glass containing less than 10 ppm hydroxyl ions and having, in the near infrared spectral range, an optical loss totaling less than 4 dB/km, measured in the mass, the core being fused with a jacket having a wall thickness of 2 to 20 mm and consisting essentially of synthetic quartz glass containing more than 4,000 ppm of fluorine, the jacket having a length of at least 200 mm; a method of producing the same and light conducting fibers derived therefrom.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.