Patents by Inventor Douglas Harold Weisman

Douglas Harold Weisman 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 creating a radio frequency filter
    Patent number: 6768398
    Abstract: A transmission line (218) is formed to have a characteristic impedance which increases at a first substantially exponential rate with respect to a distance from the input (202). A plurality of resonators (206-214) are coupled to the transmission line and positioned at a plurality of locations along the transmission line. The plurality of resonators has resonant frequencies that decrease at a second substantially exponential rate with respect to the distance from the input. An output signal (810, 812) is obtained at a point in the filter that produces a filter response having a corner frequency.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: July 27, 2004
    Assignee: Motorola, Inc.
    Inventors: Edgar Herbert Callaway, Jr., Raymond Louis Barrett, Jr., Gilberto Jacinto Hernandez, Douglas Harold Weisman
  • Method and apparatus for creating a radio frequency filter
    Publication number: 20030107458
    Abstract: A transmission line (218) is formed to have a characteristic impedance which increases at a first substantially exponential rate with respect to a distance from the input (202). A plurality of resonators (206-214) are coupled to the transmission line and positioned at a plurality of locations along the transmission line. The plurality of resonators has resonant frequencies that decrease at a second substantially exponential rate with respect to the distance from the input. An output signal (810, 812) is obtained at a point in the filter that produces a filter response having a corner frequency.
    Type: Application
    Filed: December 12, 2001
    Publication date: June 12, 2003
    Applicant: MOTOROLA, INC.
    Inventors: Edgar Herbert Callaway, Raymond Louis Barrett, Gilberto Jacinto Hernandez, Douglas Harold Weisman