Patents by Inventor Daniel D. Huang

Daniel D. Huang 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).

  • Photographic processing composition and film unit
    Patent number: 6001531
    Abstract: The present invention relates to a photographic processing composition comprising an aqueous alkaline medium including titanium dioxide particles and a stabilizing agent comprising a polymer polymerized from repeating units of styrene and an acrylic acid. The presence of the stabilizing agent substantially reduces the settling out of the titanium dioxide particles in the subject processing composition, and maintains the substantially uniform distribution of titanium dioxide particles therein. The subject processing compositions are useful in photographic diffusion transfer film units and processes.
    Type: Grant
    Filed: November 6, 1998
    Date of Patent: December 14, 1999
    Assignee: Polaroid Corporation
    Inventors: Fariza B. Hasan, Daniel D. Huang
  • Photographic processing compositions including hydrophobically modified thickening agent
    Patent number: 5422233
    Abstract: Photographic processing compositions comprising an aqueous alkaline medium and a hydrophobically modified thickening agent are disclosed. The subject thickening agent increases the viscosity of the processing composition while maintaining a relatively uniform homogenous mixture of the constituents thereof. The subject processing compositions are useful in photographic diffusion transfer film units and processes.
    Type: Grant
    Filed: May 17, 1994
    Date of Patent: June 6, 1995
    Assignee: Polaroid Corporation
    Inventors: Robert D. Eckert, Daniel D. Huang, Francis M. Pierce