Patents by Inventor Naohisa Koizumi

Naohisa Koizumi 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).

  • Publication number: 20240088058
    Abstract: A field effect transistor comprising: a non-doped diamond layer which has a hydrogen-terminated surface; first and second p+diamond layers which are formed on the non-doped diamond layer and sandwich a hydrogen-terminated region; a source electrode which is formed on the first p+diamond layer and is made of metal; a drain electrode which is formed on the second p+diamond layer and is made of metal; an insulating layer which is formed on the hydrogen-terminated region of the non-doped diamond layer; and a gate electrode which is formed on the insulating layer, a mutual conductance being equal to or higher than 0.5 mS/mm at room temperatures, after an X-ray is applied for an amount of 5 Mgy.
    Type: Application
    Filed: December 28, 2021
    Publication date: March 14, 2024
    Applicant: OOKUMA DIAMOND DEVICE Inc.
    Inventors: Junichi KANEKO, Hitoshi KOIZUMI, Takahiro YAMAGUCHI, Naohisa HOSHIKAWA, Hitoshi UMEZAWA, Hideaki YAMADA, Shinya OHMAGARI
  • Patent number: 6570580
    Abstract: An apparatus for information display for displaying not only periodic information in accordance with schedule, but also non-periodic information regardless of the schedule, to passengers and passersby in stations, airports, harbors, bus terminals and streets, and the like. The apparatus comprises an information-storing section for storing a plurality of non-periodic information to be displayed regardless of the schedule, an input circuit for receiving a plurality of input signals transmitted from an external device or a remote place and display control section for simultaneously displaying the non-periodic information and periodic information which correspond to the kind of an input signal, when the apparatus receives this input signal from the external apparatus or the remote place. The apparatus may be a multi-screen display type having a plurality of screens.
    Type: Grant
    Filed: November 15, 1999
    Date of Patent: May 27, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Hitoshi Suzuki, Naohisa Koizumi, Goro Ohnishi, Tomohisa Kohiyama, Kazushi Kobayashi, Takeshi Igarashi, Hironori Oikawa, Hiroyuki Mano
  • Patent number: 5418171
    Abstract: The present invention relates to an apparatus for determining the presence or absence of a target analyte in a liquid sample, comprising:(i) a container capable of accommodating the liquid sample and having a transparent portion; and(ii) an insertion member which is capable of being inserted into the container comprising;a porous member which has a main surface and a reverse surface and which has on the main surface a substance capable of specifically binding to the target analyte; andan absorbent bonded to the reverse surface of the porous member;the porous member being supported in the insertion member whereby, when the insertion member is inserted into the container, the main surface can be observed from the outside of the container through the transparent portion of the vessel and the liquid sample is absorbed into the absorbent through the porous member.According to the analyzer of the present invention, the presence or absence of a target analyte in a sample can be easily determined.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: May 23, 1995
    Assignee: Meiji Seika Kabushiki Kaisha
    Inventors: Fumio Kimura, Naohisa Koizumi, Koichi Matsuo, Minoru Aoyagi, Kiyomi Harakawa
  • Patent number: 5366858
    Abstract: The present invention provides a method of detecting microorganisms, comprising the step of converting physical forms of microorganisms by antigen-antibody reaction and successively measuring the information that shows the physical forms of the converted data, and the step of comparing a statistical pattern of the values thus measured and a reference statistical pattern of a control subjected to no antigen-antibody reaction, thus detecting the microorganisms of interest. A change in both patterns, i.e., no correspondence thereof, enables recognition of the presence of the microorganisms of interest.
    Type: Grant
    Filed: September 18, 1992
    Date of Patent: November 22, 1994
    Assignees: Canon Kabushiki Kaisha, Meiji Seika Kaisha
    Inventors: Naohisa Koizumi, Shokichi Nakajima, Naoki Yuguchi, Kazumi Tanaka