Patents by Inventor Martin C. Gomme

Martin C. Gomme 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).

  • Optical device
    Patent number: 5310222
    Abstract: An optical security device for use on a security article comprises a number of layers including an optically diffracting layer and an at least partially reflective layer which together generate a first image. A non-optically diffracting second image is provided within the device in association with the first image.
    Type: Grant
    Filed: April 8, 1992
    Date of Patent: May 10, 1994
    Assignee: De La Rue Holographics Limited
    Inventors: Charles E. Chatwin, Ralph Kay, Martin C. Gomme, David Ezra
  • Security card and security card blank
    Patent number: 4747620
    Abstract: A security card blank comprises a plurality of superposed layers (5,5',6,7,8,9) including a metallic layer (5,5'). The metallic layer comprises any radiation absorbent, metal, metalloid, or their alloys or derivatives, such as oxides or sulphides. The metallic layer (5,5') is positioned within the card blank and is imageable only under the influence of high intensity radiation to produce a security card. After imaging, at least part of the imaged metallic layer is detectable from outside the card.
    Type: Grant
    Filed: August 13, 1986
    Date of Patent: May 31, 1988
    Assignee: The De La Rue Company PLC
    Inventors: Ralph Kay, Martin C. Gomme