Patents by Inventor Alan Johnstone

Alan Johnstone 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).

  • Fluid-jet printhead and method of fabricating a fluid-jet printhead
    Publication number: 20020135640
    Abstract: A fluid-jet printhead has a substrate having at least one layer defining a fluid chamber for ejecting fluid. The printhead also includes a resistive layer disposed between the fluid chamber and the substrate wherein the fluid chamber has a smooth planer surface between the fluid chamber and the substrate. The printhead has a conductive layer disposed between the resistive layer and the substrate wherein the conductive layer and the resistive layer are in direct parallel contact. The conductive layer forms at least one void creating a planar resistor in the resistive layer. The planar resistor is aligned with the fluid chamber.
    Type: Application
    Filed: May 13, 2002
    Publication date: September 26, 2002
    Inventors: Zhizang Chen, Genbao Xu, Mark Alan Johnstone, John P. Whitlock
  • Fluid-jet printhead and method of fabricating a fluid-jet printhead
    Publication number: 20020075346
    Abstract: A fluid-jet printhead has a substrate having at least one layer defining a fluid chamber for ejecting fluid. The printhead also includes a resistive layer disposed between the fluid chamber and the substrate wherein the fluid chamber has a smooth planer surface between the fluid chamber and the substrate. The printhead has a conductive layer disposed between the resistive layer and the substrate wherein the conductive layer and the resistive layer are in direct parallel contact. The conductive layer forms at least one void creating a planar resistor in the resistive layer. The planar resistor is aligned with the fluid chamber.
    Type: Application
    Filed: December 20, 2000
    Publication date: June 20, 2002
    Inventors: Genbao Xu, Zhizang Chen, Mark Alan Johnstone, John P. Whitlock