Method of coating inner and outer surfaces of pipes for thermal solar and other applications
US8343593B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2009 |
| Grant date | Jan 1, 2013 |
| Priority date | — |
| Expiry date | Apr 9, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J37/32706
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of coating at least one exterior surface of at least one workpiece is disclosed. The method may be used for coating inner and outer surfaces of pipes. A hollow workpiece is positioned within a chamber. A spacing between a multi-dimensional interior surface of the chamber and an exterior surface of the workpiece is fixed. Conditions are established to maintain a hollow cathode effect within the spacing and within the hollow workpiece. The conditions include biasing anodes at opposite ends of a hollow cathode effect region, and biasing the interior surface of the chamber and the workpiece as cathodes. The interior surface and the workpiece may be maintained at a common bias voltage or, in at least one embodiment, at differing voltages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.