Patents by Inventor Nathan James Croft

Nathan James Croft 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).

  • Controller for a high frequency agitation source
    Patent number: 7825564
    Abstract: A controller for a high-frequency agitation source includes a signal generator to generate a drive signal having a variable duty cycle. The drive signal is used to drive the high-frequency agitation source. The controller also includes a temperature detector to detect the temperature of the high-frequency agitation source. The controller is configured to vary the duty cycle of the drive signal in response to the temperature of the high-frequency agitation source. By varying the duty cycle of the drive signal, the average power supplied to the piezoelectric crystal can be varied while still maintaining a fixed amplitude of oscillation. This allows the temperature of a high-frequency agitator, for example, a piezoelectric crystal, to be controlled.
    Type: Grant
    Filed: February 7, 2007
    Date of Patent: November 2, 2010
    Assignee: Dyson Technology Limited
    Inventors: Nathan James Croft, Paul Graham Douglas
  • Controller for a High Frequency Agitation Source
    Publication number: 20090026883
    Abstract: A controller for a high-frequency agitation source includes a signal generator to generate a drive signal having a variable duty cycle. The drive signal is used to drive the high-frequency agitation source. The controller also includes a temperature detector to detect the temperature of the high-frequency agitation source. The controller is configured to vary the duty cycle of the drive signal in response to the temperature of the high-frequency agitation source. By varying the duty cycle of the drive signal, the average power supplied to the piezoelectric crystal can be varied while still maintaining a fixed amplitude of oscillation. This allows the temperature of a high-frequency agitator, for example, a piezoelectric crystal, to be controlled.
    Type: Application
    Filed: February 7, 2007
    Publication date: January 29, 2009
    Inventors: Nathan James Croft, Paul Graham Douglas