Patents by Inventor Anthony Arthur Leonard Challis

Anthony Arthur Leonard Challis 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).

  • Medical dressing having a thermally expandable passage
    Patent number: 5834093
    Abstract: A bilayer laminated medical dressing having a thermally expandable passage is provided. The medical dressing achieves gas permeability as a function of temperature by cutting a star-shaped hole through the dressing when the dressing is flat and relaxed. On warming, the leaves between the radial cuts of the star-shaped hole curl and increase the hole size. Such a material is useful as a medical dressing.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: November 10, 1998
    Assignee: British Technology Group Limited
    Inventors: Anthony Arthur Leonard Challis, Michael John Bevis
  • Material having a thermally expandable passage
    Patent number: 5672406
    Abstract: A bilayer laminated material has a gas permeability increasing greatly with temperature, achieved by cutting a star-shaped hole in it when it is relaxed and flat. On warming, the leaves between the radial cuts curl and disproportionately increase the hole size. Such a material, if flat at 5.degree. C. and wide open at 20.degree. C., is useful for packaging vegetable produce.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: September 30, 1997
    Assignee: British Technology Group Limited
    Inventors: Anthony Arthur Leonard Challis, Michael John Bevis