Patents by Inventor Yia-Ching Ray

Yia-Ching Ray 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).

  • Self-dispersing pigment and process of making and use of same
    Patent number: 6852156
    Abstract: A process is provided in which a pigment is oxidated with ozone in an aqueous environment in which the mixture of ozone, water and pigment is subjected to a dispersive mixing operation; and/or the pH of the mixture is maintained in a range of 6-8, whereby the pigment is self-dispersing and preferably has an acid value of less than 3 ?moles/M2. Pigments from this process and ink jet inks containing the self-dispersing pigments, are also provided.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: February 8, 2005
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: An-Gong Yeh, Michael J. Eiseman, Robert Paul Held, James L. Hohman, Dhiren V. Patel, Yia-Ching Ray, Harry Joseph Spinelli, Sandra L. Witman
  • Self-dispersing pigment and process of making and use of same
    Publication number: 20020014184
    Abstract: A process is provided in which a pigment is oxidated with ozone in an aqueous environment in which the mixture of ozone, water and pigment is subjected to a dispersive mixing operation; and/or the pH of the mixture is maintained in a range of 6-8, whereby the pigment is self-dispersing and preferably has an acid value of less than 3 &mgr;moles/M2. Pigments from this process and ink jet inks containing the self-dispersing pigments, are also provided.
    Type: Application
    Filed: May 23, 2001
    Publication date: February 7, 2002
    Inventors: An-Gong Yeh, Michael J. Eiseman, Robert Paul Held, James L. Hohman, Dhiren V. Patel, Yia-Ching Ray, Harry Joseph Spinelli, Sandra L. Witman
  • Polyimide film with tin or tin salt incorporation resulting in improved adhesion
    Patent number: 5218034
    Abstract: A polyimide film having improved adhesion and thermal durability containing from 0.02 to 1% by weight of tin based on the weight of the film. A process for preparing a polyimide film is also described wherein a tin (II) or tin (IV) salt is introduced into a film-forming polyamide acid polymer prior to the casting step.
    Type: Grant
    Filed: August 21, 1991
    Date of Patent: June 8, 1993
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Stuart N. Milligan, Yia-Ching Ray