Patents by Inventor John P. Ludlum

John P. Ludlum 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: 4652464
    Abstract: A method for printing fine or commercial art utilizing visible and/or invisible fluorescent colorants and non-fluorescent colorants in a multiple series of colorant applications with each color application being made with with a predetermined print pattern. As used herein, "fluoresecent colorants" are those which emit visible light under the ultraviolet (black light), including those which are colored and those which are colorless under visible light. The colorants are applied to a base in layers or by blending the fluorescent and non-fluorescent colorants to achieve a predetermined piece of art work. Some of the layers of colorants are used to mask, or partly mask, the brilliance of some of the fluorescent layers, in graduating degrees for viewing under ulrtraviolet observation, or viewing in other lighting conditions.
    Type: Grant
    Filed: August 5, 1985
    Date of Patent: March 24, 1987
    Inventors: John P. Ludlum, Shirley G. Ludlum