Patents by Inventor Kazuhiko Matsushita

Kazuhiko Matsushita has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electret
    Patent number: 11915883
    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.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: February 27, 2024
    Assignees: DENSO CORPORATION, TOKYO UNIVERSITY OF SCIENCE FOUNDATION
    Inventors: Noriyuki Matsushita, Yoshihiro Kozawa, Kazuhiko Kanoh, Yumi Tanaka, Hirotoshi Otsuka, Yuki Kotaka
  • Electret
    Patent number: 11917919
    Abstract: An electret includes a substrate and an electret layer formed above a surface of the substrate. The electret layer is a composite metal compound containing two or more different metal elements, and is obtained by subjecting a thin film mainly composed of an inorganic dielectric material having a bandgap energy of 4 eV or more to a polarization treatment.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: February 27, 2024
    Assignees: DENSO CORPORATION, TOKYO UNIVERSITY OF SCIENCE FOUNDATION
    Inventors: Noriyuki Matsushita, Yoshihiro Kozawa, Kazuhiko Kanoh, Yumi Tanaka
  • Method of acid value determination by infrared absorption
    Patent number: 5420041
    Abstract: A method of determining acid value with high accuracy, using an infrared spectrometer is provided, in which the absorbance is determined attributable to carboxylic group based on an infrared absorption spectrum at wave numbers around 3300 cm.sup.-1.
    Type: Grant
    Filed: September 23, 1993
    Date of Patent: May 30, 1995
    Assignee: Kurashiki Boseki Kabushiki Kaisha
    Inventors: Kazuhiko Matsushita, Hiroshi Yokota, Keiji Fujita, Akihiro Tsukamoto