Patents by Inventor Roy Alan Kirk

Roy Alan Kirk 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).

  • Heat sensitive recording material
    Patent number: 6624117
    Abstract: A heat sensitive recording material, comprising a) at least one colour forming compound, and b) at least one developer of the formula  wherein R1 is unsubstituted or substituted phenyl, naphthyl or C1-C20alkyl, X is a group of the formula A is unsubstituted or substituted phenylene, naphthylene or C1-C12alkylene, or is an unsubstituted or substituted heterocyclic group, B is a linking group of formula —O—SO2—, —SO2—O—, —NH—SO2—, —SO2—NH—, —S—SO2—, —O—CO—, —O—CO—NH—, —NH—CO—, —NH—CO—O—, —S—CO—NH—, —S—CS—NH—, —CO—NH—SO2—, —O—CO—NH—SO2—, —NH═CH—, —CO—NH—CO—, —S—, —CO—, —O—, —SO2—NH—CO—, —O&m
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: September 23, 2003
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Michael Heneghan, Roy Alan Kirk, James Philip Taylor, John Whitworth, Robert Montgomery O'Neil, John Barry Henshall
  • Crystalline fluoran compound
    Patent number: 6071853
    Abstract: Disclosed are a novel crystal form of the fluoran compound represented by formula (I) as characterised by specific X-ray powder diffraction pattern and melting range; process for the preparation of said novel crystal form and recording materials comprising the said crystal form.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: June 6, 2000
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Roy Alan Kirk, Jonathon Gawtrey, Michael Heneghan, John Whitworth, Ian Antony Dearden, James Philip Taylor, John Barry Henshall