Patents by Inventor Curtis M. Allen

Curtis M. Allen 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).

  • Constant impedance filter
    Patent number: 8154362
    Abstract: A method and apparatus to provide a bi-directional constant impedance filter. Embodiments include electric networks which give filter responses while presenting a constant impedance to a signal received at either an input or an output port for a plurality of frequencies.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: April 10, 2012
    Assignee: 2Wire, Inc.
    Inventor: Curtis M. Allen
  • TRANSMISSION LINE SIMULATOR
    Publication number: 20100246413
    Abstract: A method and apparatus to simulate a length of telecommunications line. One or more bi-directional constant input impedance low pass or pole/zero filters are coupled in series with an attenuator to simulate a length of telecommunications line. The one or more filters are used to approximate the transfer function of the length of telecommunications line.
    Type: Application
    Filed: March 31, 2009
    Publication date: September 30, 2010
    Applicant: 2WIRE, INC.
    Inventors: James T. Schley-May, Curtis M. Allen
  • CONSTANT IMPEDANCE FILTER
    Publication number: 20100244983
    Abstract: A method and apparatus to provide a bi-directional constant impedance filter. Embodiments include electric networks which give filter responses while presenting a constant impedance to a signal received at either an input or an output port for a plurality of frequencies.
    Type: Application
    Filed: March 31, 2009
    Publication date: September 30, 2010
    Applicant: 2WIRE, INC.
    Inventor: Curtis M. Allen
  • Dual channel frequency synthesizer system
    Patent number: 4648060
    Abstract: A signal synthesizer system allowing a wide variety of signal sources for test and evaluation is provided. In one embodiment, the signal synthesizer system is a phase calibration system resulting in a wideband, variable phase two channel synthesized source with good phase accuracy over its entire frequency range.
    Type: Grant
    Filed: July 30, 1984
    Date of Patent: March 3, 1987
    Assignee: Hewlett-Packard Company
    Inventors: Curtis M. Allen, Larry J. Smith