Patents by Inventor Francis H. Sansbury

Francis H. Sansbury 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).

  • Hydrogen atom donor compounds as contrast enhancers for black-and-white photothermographic and thermographic elements
    Patent number: 5637449
    Abstract: Hydrogen atom donor compounds are useful as contrast enhancers when used in combination with (i) hindered phenol developers, and (ii) trityl hydrazide and/or formyl-phenyl hydrazine co-developers, to produce ultra-high contrast black-and-white photothermographic and thermographic elements.The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.
    Type: Grant
    Filed: September 19, 1995
    Date of Patent: June 10, 1997
    Assignee: Imation Corp
    Inventors: Lori S. Harring, Sharon M. Simpson, Francis H. Sansbury
  • Hydroxamic acid compounds as contrast enhancers for black-and-white photothermographic and thermographic elements
    Patent number: 5545507
    Abstract: Hydroxamic acid compounds are useful as contrast enhancers when used in combination with (i) hindered phenol developers, and (ii) trityl hydrazide and/or formyl-phenyl hydrazine co-developers, to produce ultra-high contrast black-and-white photothermographic and thermographic elements.The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.
    Type: Grant
    Filed: September 19, 1995
    Date of Patent: August 13, 1996
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Sharon M. Simpson, Francis H. Sansbury