Patents by Inventor Tom Spalding

Tom Spalding 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).

  • Antenna system including simultaneous phase aiding and phase canceling elements
    Patent number: 7023346
    Abstract: A system for minimizing the effect of null zones in an interrogation zone of a marker detection system. The system includes a reference antenna system configured to produce a first reference electromagnetic field during a first time period. The antenna system also includes a phase canceling antenna system configured to produce a second electromagnetic field substantially in phase with the reference electromagnetic field during the first time period and a third electromagnetic field substantially out of phase with the reference electromagnetic field during the first time period. The phasing of the first field or the second and third fields may be continuously switched while the phase of the other is held constant. A method of spatially shifting null zones in an interrogation zone of a marker detection system is also provided.
    Type: Grant
    Filed: May 27, 2004
    Date of Patent: April 4, 2006
    Assignee: Sensormatic Electronics Corporation
    Inventors: Brent F. Balch, John O'Connell, William H. Hurd, Tom Spalding
  • Antenna system including simultaneous phase aiding and phase canceling elements
    Publication number: 20050162276
    Abstract: A system for minimizing the effect of null zones in an interrogation zone of a marker detection system. The system includes a reference antenna system configured to produce a first reference electromagnetic field during a first time period. The antenna system also includes a phase canceling antenna system configured to produce a second electromagnetic field substantially in phase with the reference electromagnetic field during the first time period and a third electromagnetic field substantially out of phase with the reference electromagnetic field during the first time period. The phasing of the first field or the second and third fields may be continuously switched while the phase of the other is held constant. A method of spatially shifting null zones in an interrogation zone of a marker detection system is also provided.
    Type: Application
    Filed: May 27, 2004
    Publication date: July 28, 2005
    Inventors: Brent Balch, John O'Connell, William Hurd, Tom Spalding
  • Pipework template
    Patent number: 6077000
    Abstract: A template 20 with which pipework may be correctly positioned in a wall for connection to a wall mounted unit, the template comprising first apertures 24 for guiding drills at desired positions of pipes in the wall, and second apertures 22 for screwing the template to a wall, wherein the second apertures 22 are spaced and dimensioned such that the wall mounted unit may be mounted on the wall using the screw holes created by the second apertures 22 and be correctly aligned with pipework positioned according to the first apertures 24, each of the first apertures 24 may comprise a centrally mounted annular member 28 defining an aperture through which a center hole may be drilled.
    Type: Grant
    Filed: March 3, 1997
    Date of Patent: June 20, 2000
    Assignee: Aqualisa Products Limited
    Inventors: Kevin Norman White Gibbons, Tom Spalding
  • Electronic article surveillance pedestal antenna
    Patent number: D480388
    Type: Grant
    Filed: October 9, 2002
    Date of Patent: October 7, 2003
    Assignee: Sensormatic Electronics Corporation
    Inventors: Sean Spelman, Tom Spalding, John O'Connell, David Shaft, Dale Raymond