Patent · US Expired

Plasma method for coating the inside surface of a glass tube

US4473596A · kind A · utility

31Cited by

5References

5Claims

0Family size

Assignee

International Standard Electric Corporation · US

Inventors

Hans Beerwald · Schleiden, DE
Gunter Bohm · Bochum, DE
Gunter Glomski · Bochum, DE
Manfred Wittmann · Rutzenmoos, AT

Key dates

Filing date	Feb 8, 1983
Grant date	Sep 25, 1984
Priority date	—
Expiry date	Feb 8, 2003

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03B37/01846
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method of making optical fibers by plasma chemical vapor deposition (PCVD) is disclosed wherein the pressure in the glass tube is maintained constant by controlling the rate of evacuation. The pressure-dependent controlled variable is preferably the impedance of the plasma-producing device, and the rate of evacuation is controlled in such a way that this impedance remains constant.

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