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US 11,915,883 B2Granted
Electret
AssigneesDenso Corporation, Tokyo University of Science Foundation
InventorsNoriyuki Matsushita, Yoshihiro Kozawa, Kazuhiko Kanoh, Yumi Tanaka, Hirotoshi Otsuka, Yuki Kotaka
Life of this patent
Estimating the term…
Abstract
An electret includes an electret layer. The electret layer is formed by subjecting a composite film in which inorganic dielectric particles are dispersed and held in a base film to a polarization treatment. The inorganic dielectric particles are mainly composed of an inorganic dielectric material having a bandgap energy of 4 eV or more.
Claims9
An electret comprising an electret layer, wherein
- the electret layer is formed by subjecting a composite film in which inorganic dielectric particles are dispersed and held in a base film to a polarization treatment, and
- the inorganic dielectric particles are mainly composed of an inorganic dielectric material having a bandgap energy of 4 eV or more.
Dependencies are inferred from the claim text.