Patents by Inventor GRAHAM WHITCHURCH

GRAHAM WHITCHURCH 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).

  • PACKAGING AND METHOD OF MANUFACTURE THEREOF
    Publication number: 20090250370
    Abstract: Packaging is provided having one or more walls formed from a material comprising two or more layers of polyvinyl alcohol which have been co-extruded or co-moulded together during manufacture. The polyvinyl alcohol used in at least two of the layers differs in type, form, thickness and/or one or more characteristics.
    Type: Application
    Filed: April 7, 2009
    Publication date: October 8, 2009
    Applicant: CHEMLINK SPECIALITIES LIMITED
    Inventor: GRAHAM WHITCHURCH
  • Extrusion Process
    Publication number: 20070232720
    Abstract: A polymer film is made by mixing pellets of starch and of PVA together, and then thermoplastically extruding the mixture. The mixture should contain at least 10% and preferably at least 25% (by weight) of each polymer, and extrusion generates a homogeneous film which appears uniform. It can be as thin as 20 ?m. The resulting film is readily biodegradable, water-soluble or water-dispersible, and has good physical properties. This same pellet mixing extrusion process, followed by injection moulding, can be used to form other objects.
    Type: Application
    Filed: May 11, 2005
    Publication date: October 4, 2007
    Inventor: Graham Whitchurch