Patents by Inventor Curtis W. Ingalls

Curtis W. Ingalls 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).

  • Patent number: 4210346
    Abstract: Disclosed is a protected document such as a negotiable instrument, a title instrument, identification document or other documents which should be kept secure from illegal copying by color copiers. The method of making the document comprising preprinting a "VOID" or other warning or cancellation phrase pattern in half tone or multitone on the document and camouflaging this pattern is also disclosed. The document bears a watermark which adds to the security of the system.
    Type: Grant
    Filed: June 23, 1977
    Date of Patent: July 1, 1980
    Assignee: Burroughs Corporation
    Inventors: William H. Mowry, Jr., Michael J. McElligott, Victor J. Tkalenko, Jr., Joseph Baran, Curtis W. Ingalls