Patents by Inventor Leigh L. Keng

Leigh L. Keng 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).

  • Document protecting apparatus
    Patent number: 5543010
    Abstract: A document laminate includes laminating sheets with adhesive on facing sides to laminate a document between the sheets, and shielding sheets covering the document and received within the laminating sheets. When the adhesive is heat activated, the shielding sheets are selected to be not degraded by the activating heat. A document can therefore be removed from the laminate by cutting along a line at one edge of the shielding sheets, and removing the document, which is not adhered to the shielding sheets or the laminating sheets.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: August 6, 1996
    Inventor: Leigh L. Keng
  • Document protecting apparatus
    Patent number: 5362540
    Abstract: A document laminate includes laminating sheets with adhesive on facing sides to laminate a document between the sheets, and shielding sheets covering the document and received within the laminating sheets. When the adhesive is heat activated, the shielding sheets are selected to be not degraded by the activating heat. A document can therefore be removed from the laminate by cutting along a line at one edge of the shielding sheets, and removing the document, which is not adhered to the shielding sheets or the laminating sheets.
    Type: Grant
    Filed: May 3, 1993
    Date of Patent: November 8, 1994
    Inventor: Leigh L. Keng
  • Personal laminator
    Patent number: D342271
    Type: Grant
    Filed: June 17, 1992
    Date of Patent: December 14, 1993
    Inventor: Leigh L. Keng