Patents by Inventor Nobuhiro Yokoo

Nobuhiro Yokoo 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).

  • Comb-shape response filter having ultrasonic delay line
    Patent number: 4746971
    Abstract: A comb-shape filter which comprises an ultrasonic delay device, a branch line adapted to apply a part of an input for the ultrasonic delay device to its output terminal without passing through the ultrasonic delay device and a band elimination filter provided in the branch line.
    Type: Grant
    Filed: June 26, 1986
    Date of Patent: May 24, 1988
    Assignee: Asahi Glass Company Ltd.
    Inventors: Etsuji Kimura, Nobuhiro Yokoo, Shigeru Ueno
  • Glass for use in ultrasonic delay lines
    Patent number: 4123731
    Abstract: A glass suitable for use in ultrasonic delay lines which comprises the components by weight, SiO.sub.2 42 to 27%, PbO 71 to 52% and preferably contains K.sub.2 O and/or Na.sub.2 O. The glass further contains PbF.sub.2, BaF.sub.2, KHF.sub.2, K.sub.2 SiF.sub.6, Na.sub.2 SiF.sub.6, ZnO, CdO, BaO, SrO, ZrO.sub.2, TiO.sub.2, La.sub.2 O.sub.3, Al.sub.2 O.sub.3, B.sub.2 O.sub.3, Sb.sub.2 O.sub.3 and As.sub.2 O.sub.3.This invention is characterized by a low rate of shear wave propagation (V) in the glass. The delay line can be used for a dropout compensator circuit of Video Tape Recorder or Video Disk Players.
    Type: Grant
    Filed: August 24, 1977
    Date of Patent: October 31, 1978
    Assignee: Asahi Glass Company, Ltd.
    Inventors: Tohru Kanbara, Michihiko Uemura, Nobuhiro Yokoo