Patents by Inventor Francis M. Pierce

Francis M. Pierce 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 element and method
    Patent number: 6100005
    Abstract: There is described a novel diffusion transfer photographic system wherein an exposed diffusion transfer photographic film unit is developed with an aqueous alkaline processing composition in the presence of alumina-free titanium dioxide.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: August 8, 2000
    Assignee: Polaroid Corporation
    Inventors: Daniel J. Churella, Wilhelm J. Erdmann, Gerard Gomes, John R. Linton, Francis M. Pierce
  • 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