Composition for opaque coating, lamp with coating, and method of manufacture
US7413600B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2007 |
| Grant date | Aug 19, 2008 |
| Priority date | — |
| Expiry date | Feb 15, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C2218/111
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A composition for the manufacture of an opaque silvery coating on a glass surface is provided. The composition comprises a mixture of at least two metal powders. The metal powder mixture contains carbonyl iron and aluminum, and a carrier liquid for forming a suspension of the metal powder mixture. A method for manufacturing an opaque silvery coating for a lamp having a glass envelope is also provided. In the method, a suspension comprising a mixture of carbonyl iron and aluminum powders in a carrier liquid is applied onto the envelope of the lamp. The suspension is dried, and thereafter the composition remaining from the suspension is burned at a temperature above 500° C. A lamp with a glass envelope and a single layer opaque coating covering at least a part of the glass envelope is also disclosed. The opaque coating comprises 50 to 80 weight % carbonyl iron and 20 to 50 weight % elementary aluminum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.