Patents by Inventor Masakazu Konno

Masakazu Konno 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).

  • Patent number: 10425116
    Abstract: An elastic wave device includes a LiNbO3 substrate, an IDT electrode provided on the LiNbO3 substrate, and a dielectric film that is provided on the LiNbO3 substrate so as to cover the IDT electrode and includes a projection on an upper surface of the stated dielectric film. A main mode of an elastic wave excited by the IDT electrode uses a Rayleigh wave, and a thickness of the IDT electrode is set such that a frequency at which a response by an SH wave appears is lower than a resonant frequency of the Rayleigh wave.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: September 24, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Akira Konno, Masakazu Mimura
  • Patent number: 5076836
    Abstract: A process for the preparation of ferromagnetic metallic particles for magnetic recording which comprises(I) a step of preparing a slurry of acicular iron oxide hydrate containing nickel and, if necessary, manganese,(II) a step of coating the surface of the above iron oxide hydrate with aluminum-containing iron oxide hydrate, thus giving a slurry containing the coated iron oxide hydrate and free aluminate ions,(III) a step of depositing aluminum and phosphorus and/or silicon on the outside surface of the aluminum-containing iron oxide hydrate, thereby giving a slurry of the iron oxide hydrate thus treated,(IV) a step of subjecting the slurry to washing, drying and dehydrating, reducing the obtained particles, and forming an oxide layer on the surface of the reduced particles.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: December 31, 1991
    Assignee: Mitsui Mining & Smelting Co., Ltd.
    Inventors: Isshi Hisaoka, Masakazu Konno, Nobuo Takagi
  • Patent number: 4597958
    Abstract: In a method of producing a hydrated iron oxide as a starting material for a magnetic powder by aging a suspension of a ferric hydroxide prepared by reacting a ferric salt with an aqueous solution of alkali, the aging temperature is controlled between 20.degree. and 100.degree. C. and pH is controlled between 1 and 6 for the first 5 to 240 minutes while nuclei of hydrated iron oxide crystals generate, and then the aqueous solution of alkali is added again to adjust the pH value to 10 to 13.5 to make the crystals grow. This production method is capable of producing an acicular hydrated iron oxide having a reduced particle-size distribution range and also capable of controlling the length of the crystals as desired.
    Type: Grant
    Filed: September 17, 1984
    Date of Patent: July 1, 1986
    Assignee: Mitsui Mining & Smelting Co., Ltd.
    Inventors: Nobuo Takagi, Masakazu Konno, Takeo Kobayashi