Patents by Inventor Alan L. Sink

Alan L. Sink 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).

  • Varying tone securing document
    Patent number: 5197765
    Abstract: An improved security document which protects documents from copying on color copying machines. The document has cancellation terms and background pattern in two tones. If the copier is adjusted to obscure the cancellation term on reproduced copies at one tone, the cancellation at the other tone will appear. In an alternative embodiment, the density of the cancellation term and the background pattern vary across the face of the document. In this case, the cancellation term will appear somewhere on the copy no matter what copier adjustments are made.
    Type: Grant
    Filed: July 12, 1991
    Date of Patent: March 30, 1993
    Assignee: The Standard Register Company
    Inventors: William H. Mowry, Jr., Alan L. Sink, George W. Stubbs, John S. Simpson, John F. Kane