Patents by Inventor Stephen L. Nicholls

Stephen L. Nicholls 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).

  • Liquid developer for electrostatography
    Patent number: 5612162
    Abstract: A composition and a method of forming a liquid developer or a constituent of a liquid developer for electrostatography comprising the steps of dispersing at least one monomer in silicone fluid and polymerizing the at least one monomer to form polymer particles in the silicone fluid. A homopolymer or a copolymer may be formed and a colorant, such as a pigment or dye, and a charge control agent may be added before or after the polymerization.
    Type: Grant
    Filed: July 21, 1995
    Date of Patent: March 18, 1997
    Assignee: Research Laboratories of Australia PTY Ltd.
    Inventors: Terence M. Lawson, Stephen L. Nicholls
  • Liquid developer including organo titanate charge control agent for electrostatography
    Patent number: 5591557
    Abstract: A liquid developer for electrostatography comprising a silicone fluid, marker particles and a charge control agent which is soluble in the silicone fluid. The charge control agent may be an organo-metallic compound such as an organo titanate selected from tetra-2-ethyl hexyl titanate, tetra-n-butyl titanate and tetra isopropyl titanate. The organo-metallic compound may be present in a range of from 0.01 to 10% by weight of the toner particles, with a preferred range of 0.1 to 2% by weight. A colourant may also be included.
    Type: Grant
    Filed: July 21, 1995
    Date of Patent: January 7, 1997
    Assignee: Research Laboratories of Australia Pty Ltd.
    Inventors: Terence M. Lawson, Stephen L. Nicholls
  • Liquid ink jet ink
    Patent number: 5453121
    Abstract: An ink jet ink composition comprising a liquid having an electrical resistance of at least 10.sup.9 Ohm.cm, insoluble marking particles in a range of from 0.5% to 30% by weight and a particle charging agent in a range of from 0.05 to 5% by weight, where the marking particles are capable of being charged and concentrated into agglomerations of the particles and ejected from the ink in the presence of non-uniform electrostatic field of significant gradient in an ink jet printing apparatus.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: September 26, 1995
    Assignee: Tonejet Corporation Pty Ltd.
    Inventors: Stephen L. Nicholls, John T. Alston