Patents by Inventor Bruce Stokes

Bruce Stokes 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).

  • Electric field control of surface acoustic wave velocity
    Patent number: 7687971
    Abstract: An apparatus in one example comprises a piezoelectric layer, a first electrode along a first side of the piezoelectric layer, and a second electrode along a second side of the piezoelectric layer. The first and second electrodes are adapted to receive a voltage bias to create an electric field in the piezoelectric layer that controls an acoustic velocity of a surface acoustic wave.
    Type: Grant
    Filed: August 15, 2006
    Date of Patent: March 30, 2010
    Assignee: Northrop Grumman Corporation
    Inventors: Robert Bruce Stokes, Alvin Ming-Wei Kong
  • Surface acoustic wave passband control
    Patent number: 7656253
    Abstract: An apparatus in one example comprises a piezoelectric layer, an input transducer, an output transducer, and at least one electrode set. The input transducer is configured to convert an input signal from an input source to a surface acoustic wave and send the surface acoustic wave from an input portion of the piezoelectric layer to an output portion of the piezoelectric layer. The input transducer comprises a set of input passbands. The output transducer is configured to receive the surface acoustic wave from the output portion of the piezoelectric layer. The output transducer comprises a set of output passbands. The at least one electrode set is configured to apply at least one voltage bias to at least one portion of the piezoelectric layer to create an electric field that controls an acoustic velocity of the surface acoustic wave through the at least one portion of the piezoelectric layer.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: February 2, 2010
    Assignee: Northrop Grumman Space & Mission Systems Corporation
    Inventors: Robert Bruce Stokes, Alvin Ming-Wei Kong
  • Surface acoustic wave passband control
    Publication number: 20080258843
    Abstract: An apparatus in one example comprises a piezoelectric layer, an input transducer, an output transducer, and at least one electrode set. The input transducer is configured to convert an input signal from an input source to a surface acoustic wave and send the surface acoustic wave from an input portion of the piezoelectric layer to an output portion of the piezoelectric layer. The input transducer comprises a set of input passbands. The output transducer is configured to receive the surface acoustic wave from the output portion of the piezoelectric layer. The output transducer comprises a set of output passbands. The at least one electrode set is configured to apply at least one voltage bias to at least one portion of the piezoelectric layer to create an electric field that controls an acoustic velocity of the surface acoustic wave through the at least one portion of the piezoelectric layer.
    Type: Application
    Filed: April 18, 2007
    Publication date: October 23, 2008
    Inventors: Robert Bruce Stokes, Alvin Ming-Wei Kong
  • Electric field control of surface acoustic wave velocity
    Publication number: 20080042517
    Abstract: An apparatus in one example comprises a piezoelectric layer, a first electrode along a first side of the piezoelectric layer, and a second electrode along a second side of the piezoelectric layer. The first and second electrodes are adapted to receive a voltage bias to create an electric field in the piezoelectric layer that controls an acoustic velocity of a surface acoustic wave.
    Type: Application
    Filed: August 15, 2006
    Publication date: February 21, 2008
    Inventors: Robert Bruce Stokes, Alvin Ming-Wei Kong
  • Odor control materials and face masks including odor control materials
    Publication number: 20050142966
    Abstract: A nonwoven fabric suitable for odor removal uses is provided. A method of treating fabrics and a face mask that removes odors are also provided.
    Type: Application
    Filed: December 31, 2003
    Publication date: June 30, 2005
    Inventors: Roger Quincy, Ronald Edens, Francis Kronzer, Eric Steindorf, Bruce Stokes, Leonard Zelazoski