Patents by Inventor Katsuhiro Imai

Katsuhiro Imai 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).

  • Method and apparatus for producing oxide series single crystals
    Patent number: 5919304
    Abstract: When producing an oxide-series single crystal by continuously pulling downwardly by .mu. pulling down method, the composition of the single crystal can properly and quickly controlled to continuously produce the single crystal of a constant composition by changing the pulling rate of the single crystal. Preferably, the pulling rate is 20-300 mm/hr, and the pulling rate is decreased with the proceeding of growing of the single crystal.
    Type: Grant
    Filed: August 23, 1996
    Date of Patent: July 6, 1999
    Assignee: NGK Insulators, Ltd.
    Inventors: Minoru Imaeda, Katsuhiro Imai, Tsuguo Fukuda
  • Second harmonic generation element and a process for producing the same
    Patent number: 5737117
    Abstract: A second harmonic generation element including a single crystal substrate having a fundamental composition of K.sub.3 Li.sub.2-2x (Nb.sub.1-y Ta.sub.y).sub.5+5z O.sub.15-x+12.5z and an optical waveguide made of an epitaxial film with a fundamental composition of K.sub.3 Li.sub.2-2a (Nb.sub.1-b Ta.sub.b).sub.5+5c O.sub.15-a+12.5c and refractive index different from that of the single crystal substrate, wherein:-0.5.ltoreq.a, x.ltoreq.0.6250.ltoreq.b, y.ltoreq.0.50.8.ltoreq.(5-2x)/(5+5z), (5-2a)/(5+5c).ltoreq.1.2.
    Type: Grant
    Filed: April 5, 1996
    Date of Patent: April 7, 1998
    Assignee: NGK Insulators, Ltd.
    Inventors: Minoru Imaeda, Katsuhiro Imai, Tatsuo Kawaguchi, Takashi Yoshino, Akihiko Honda
  • Developer and finely particulate polymer
    Patent number: 5716748
    Abstract: The invention provides a developer comprising toner particles and a finely particulate polymer, wherein the finely particulate polymer is a finely particulate polymer of core-shell structure, which has a core part formed of a vinyl aromatic hydrocarbon polymer and a shell part formed of a (meth)acrylic ester polymer, and is obtained by a soap-free emulsion polymerization process. The developer has stable flowability and charging properties. The invention also provides such a finely particulate polymer and a preparation process thereof.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: February 10, 1998
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Jun Hasegawa, Katsuhiro Imai, Nobuyasu Ota, Kazunori Shigemori
  • Single crystal growing method
    Patent number: 5690734
    Abstract: A process is disclosed for continuously producing a single crystal by drawing downwardly a melt of a single crystal raw material, wherein a single crystal body grown from the melt is continuously pulled downwardly, and a plurality of single crystal products are continuously formed by intermittently cutting the single crystal body being downwardly moved.
    Type: Grant
    Filed: March 19, 1996
    Date of Patent: November 25, 1997
    Assignee: NGK Insulators, Ltd.
    Inventors: Minoru Imaeda, Akihiko Honda, Katsuhiro Imai, Yuichiro Imanishi, Nobuyuki Kokune, Shoji Sogo, Kazuaki Yamaguchi, Tetsuo Taniuchi