Patents by Inventor Ian R. Stephenson

Ian R. Stephenson 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).

  • Thermal transfer printing dye sheet
    Patent number: 5602072
    Abstract: A dye sheet for light induced thermal printing of images onto a transparent receiver sheet, with a reflective layer positioned such that laser light projected through the receiver sheet and not absorbed on the first pass through the dye sheet is reflected back so as to be absorbed on a second pass, is disclosed. An assembly for light induced thermal printing and a method of thermal printing are also disclosed.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: February 11, 1997
    Assignee: Imperial Chemical Industries PLC
    Inventors: Kenneth W. Hutt, Ian R. Stephenson
  • Thermal transfer printing receiver sheet and method
    Patent number: 5430003
    Abstract: A method of light induced thermal transfer printing which comprises printing directly onto a substantially apolar material for example a polyolefin without the need for a release agent in the dye-receptive surface and imaged receiver sheets comprising a dye receptive surface containing a substantially apolar material.
    Type: Grant
    Filed: June 6, 1994
    Date of Patent: July 4, 1995
    Assignee: Imperial Chemical Industries PLC
    Inventors: Kenneth W. Hutt, Ian R. Stephenson
  • Aromatic polymers
    Patent number: 5003032
    Abstract: The invention relates to novel polyarylethers which are essentially ketonic and which are based on the dibenzofuran molecule. Such polymers are, surprisingly, amorphous, have high Tg's eg>200.degree. C., and have surprisingly high solvent resistance.
    Type: Grant
    Filed: February 27, 1990
    Date of Patent: March 26, 1991
    Assignee: Imperial Chemical Industries PLC
    Inventors: James A. Daniels, Ian R. Stephenson