Patents by Inventor Robert Mark Pulman

Robert Mark Pulman 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).

  • Operation of droplet deposition apparatus
    Patent number: 6629740
    Abstract: In droplet deposition apparatus comprising one or more independently actuable ink ejection chambers, electrical signals are applied to reduce variation in the temperature of the droplet fluid between chambers and with variations in droplet ejection input data. Short potential difference pulses, suitable for influencing the temperature of the droplet fluid in a chamber, can be generated by application of longer duration voltages to ink chamber actuation means.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: October 7, 2003
    Assignee: Xaar Technology Limited
    Inventors: Robert Mark Pulman, Stephen Temple, Laura Ann Webb
  • Operation of droplet deposition apparatus
    Patent number: 6568779
    Abstract: In droplet deposition apparatus comprising one or more independently actuable ink ejection chambers, electrical signals are applied to reduce variation in the temperature of the droplet fluid between chambers and with variations in droplet ejection input data. Short potential difference pulses, suitable for influencing the temperature of the droplet fluid in a chamber, can be generated by application of longer duration voltages to ink chamber actuation means.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: May 27, 2003
    Assignee: XAAR Technology Limited
    Inventors: Robert Mark Pulman, Stephen Temple, Laura Ann Webb
  • Operation of droplet deposition apparatus
    Publication number: 20020140752
    Abstract: In droplet deposition apparatus comprising one or more independently actuable ink ejection chambers, electrical signals are applied to reduce variation in the temperature of the droplet fluid between chambers and with variations in droplet ejection input data. Short potential difference pulses, suitable for influencing the temperature of the droplet fluid in a chamber, can be generated by application of longer duration voltages to ink chamber actuation means.
    Type: Application
    Filed: May 31, 2002
    Publication date: October 3, 2002
    Inventors: Robert Mark Pulman, Stephen Temple, Laura Ann Webb