Patents by Inventor Katsuo Furukawa

Katsuo Furukawa 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).

  • Surface-acoustic-wave convolver
    Patent number: 5117145
    Abstract: Disclosed is a surface-acoustic-wave convolver having a toroidal coil connected to each interdigital electrode as a matching and balanced-to-unbalanced converting circuit. The use of the toroidal coil wound on an associated toroidal core permits the reduction of required parts in number thanks to its dual function, and accordingly reduction of manufacturing cost and size of the device. Still advantageously the use of such a toroidal winding permits the suppression of spurious or noise signals in an SAW device.
    Type: Grant
    Filed: March 23, 1990
    Date of Patent: May 26, 1992
    Assignee: Clarion Co., Ltd.
    Inventor: Katsuo Furukawa
  • Surface acoustic wave device
    Patent number: 5045743
    Abstract: A surface acoustic wave device including a surface acoustic wave convolver element, provided with two input transducers disposed on a piezoelectric substrate and a rectangular output gate disposed between the two input transducers, is disclosed, in which it comprises further a binary tree connected with the output gate and a matching circuit connected with the binary tree stated above, which is a Tchebycheff type impedance transforming circuit.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: September 3, 1991
    Assignee: Clarion Co., Ltd.
    Inventor: Katsuo Furukawa
  • Surface-acoustic-wave convolver
    Patent number: 4950935
    Abstract: A balance-to-unbalance matching network for a surface acoustic wave device is provided in the form of a transmission line wound around a toroidal coil and having a length shorter than 1/4 the wave length at the frequency of induced acoustic waves, to provide an inductance component to cancel the susceptance of the transducer. In one embodiment the lines are would and connected to the magnetically coupled to the core so that magnetic fields are produced in the same direction by means of currents flowing into the line sections.
    Type: Grant
    Filed: October 7, 1988
    Date of Patent: August 21, 1990
    Assignee: Clarion Co., Ltd.
    Inventor: Katsuo Furukawa