Patents by Inventor Gwynneth Anne Heald

Gwynneth Anne Heald 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).

  • Plastics film, use of dyestuffs therein and process for testing the authenticity of packaged goods
    Patent number: 6596354
    Abstract: A dyestuff capable of undergoing a clearly visible colour change when contacted with a color-developing material is dispersed in the body of a plastics film and used in the identification of goods. The film can be used for packaging of the goods or as a label or seal affixed to the goods. When testing the authenticity of packaging goods, the plastics film is marked with the color-developing chemical to produce a colored mark on the package. The dyestuff is preferably a latent dyestuff which is colorless and invisible to the eye under ambient conditions for use of the film but which forms a clearly visible color when contacted with the color-developing material.
    Type: Grant
    Filed: January 16, 2001
    Date of Patent: July 22, 2003
    Assignee: Acordis Acetate Chemicals Limited
    Inventors: Tony Longdon, Gwynneth Anne Heald, Paul William Law