Patents by Inventor Ian T. Ritchie

Ian T. Ritchie 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).

  • Tranparent conductive coatings
    Patent number: 4977013
    Abstract: An article having a transparent conductive coating having predetermined interference reflectance and transmission properties substantially independent of its conductivity, comprising:(a) a substrate having a refractive index n.sub.0 and(b) a coating disposed over at least a portion of the substrate and consisting of:(i) at least one transparent dielectric layer having a refractive index n.sub.1 different from n.sub.0 ; and(ii) at least one transparent conductive layer having a refractive index substantially equal to n.sub.1, at least one of which has a thickness sufficient to provide a desired conductivity;the coating having a thickness such that it has predetermined interference reflectance and transmission properties substantially independent of its conductivity.
    Type: Grant
    Filed: June 3, 1988
    Date of Patent: December 11, 1990
    Assignee: Andus Corporation
    Inventors: Ian T. Ritchie, Wilfred C. Kittler
  • Stable high resistance transparent coating
    Patent number: 4948529
    Abstract: A stable high resistant transparent coating is formed by choosing an undoped wide band gap semiconducting oxide, and by forming a film from elements constituting the undoped oxide and from a dopant which is chosen so as to form a doped wide band gap semiconducting oxide, the doped oxide having an electrical resistance greater than the undoped oxide, the electrical resistance of the doped oxide being such that it equals an optimum value when the coating composition is inherently stable.
    Type: Grant
    Filed: June 28, 1988
    Date of Patent: August 14, 1990
    Assignee: Andus Corporation
    Inventors: Ian T. Ritchie, Wilfred C. Kittler
  • Stable high resistance transparent coating
    Patent number: 4710441
    Abstract: A stable high resistant transparent coating is formed by choosing an undoped wide band gap semiconducting oxide, and by forming a film from elements constituting the undoped oxide and from a dopant which is chosen so as to form a doped wide band gap semiconducting oxide, the doped oxide having an electrical resistance greater than the undoped oxide, the electrical resistance of the doped oxide being such that it equals an optimum value when the coating composition is inherently stable.
    Type: Grant
    Filed: December 18, 1985
    Date of Patent: December 1, 1987
    Assignee: Andus Corp.
    Inventors: Ian T. Ritchie, Wilfred C. Kittler
  • Optical recording coating
    Patent number: 4640860
    Abstract: An optical data storage coating includes a cermet structure, the cermet including metal particles disposed in a dielectric matrix, both the metal particles and dielectric matrix being formed of stable, high melting point materials preferably depositable on a substrate by sputtering.
    Type: Grant
    Filed: October 16, 1985
    Date of Patent: February 3, 1987
    Assignee: Andus Corp.
    Inventor: Ian T. Ritchie