Method of making electrets through vapor condensation
US6743464B1 · kind B1 · utility
52Cited by
25References
25Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 13, 2000 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Apr 13, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G7/023
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of making an electret includes condensing vapor from the atmosphere of a controlled environment onto a dielectric article and then drying the article to remove the condensate. The dielectric article may be a nonconductive polymeric material, and the condensate may include a polar liquid. The method is particularly useful for forming an electret from a porous material such as a nonwoven fibrous web. The method can enable individual fibers in the web to exhibit at least quasi-permanent electrical charge.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.