LED filament with colored off state masking
US11177422B2 · kind B2 · utility
1Cited by
0References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2019 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Sep 2, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED filament includes an underlying layer exhibiting a first appearance at a first temperature, and an over-coated layer comprising a thermochromic material that exhibits at the first temperature, a preselected appearance other than the first appearance, and at a second temperature, a transparent or translucent appearance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.