Patent · US Expired

Method of and device for coating the inside of tubes

US4714589A · kind A · utility

29Cited by

6References

25Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Cornelis P. Auwerda · Eindhoven, NL
Peter E. E. Geittner · Aachen, DE
Hans Lydtin · Stolberg, DE

Key dates

Filing date	Jun 30, 1986
Grant date	Dec 22, 1987
Priority date	—
Expiry date	Jun 30, 2006

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC03B37/0183
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

The inside of a tube of an electrically insulating material is coated with a layer of electrically insulating material by reactive deposition of the coating material from a gas mixture which is passed through the tube. The tube is heated and the deposition is activated by a plasma produced by microwaves. The plasma reciprocates in the tube. Energy consumption is reduced by heating the tube to the reaction temperature at least partly by the energy supplied by the plasma to the tube wall. Thermal losses of the tube are reflected back to the tube wall by a heat reflecting element.

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