Patents by Inventor Tohru Kanbara

Tohru Kanbara 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).

  • 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
  • Ultrasonic delay lines and method of making the same
    Patent number: 4034317
    Abstract: A multiple reflection type solid ultrasonic delay line which comprises a solid ultrasonic delay medium in the form of a thin flat plate having input and output transducers and reflection elements formed on the periphery thereof, and one or more arc grooves provided on part of side surfaces which is other than desirable reflection elements for ultrasonic vibration and a low melting metal or alloy being provided in said arc grooves. In the delay lines, undesirable signals are remarkably attenuated.
    Type: Grant
    Filed: March 4, 1976
    Date of Patent: July 5, 1977
    Assignee: Asahi Glass Co., Ltd.
    Inventors: Michihiko Uemura, Tohru Kanbara, Yutaka Igarashi