Lamp with an oxygen detector
US5128106A · kind A · utility
8Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1990 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Jul 12, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J7/42
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An oxygen detector for use in a double envelope lamp is described. The detector may be formed by nitriding a metal surface to produce a metal piece with a first visual color or state. The surface thickness is sufficient to exclude oxygen during normal assemble, but thin enough to change colors during lamp operation if oxygen is present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.