Patents by Inventor Peter B. Readings

Peter B. Readings 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).

  • Acidic photosensitive relief image-forming materials with indicator pigment or dye
    Patent number: 4578341
    Abstract: A relief image-forming composition having an acidic pH comprises a photosensitive component and an indicator capable of existing in two states differing in actinic opacity dependent upon pH. A relief image is formed by (1) exposing to light selected areas of a layer of the composition, the indicator being in its state of lower actinic opacity, (2) removing layer material from the exposed areas or from the unexposed areas and (3) shifting the pH in the remaining layer material to a value at which the indicator exists in its state of higher actinic opacity. The resultant image can then be used as an intermediate original in diazotype copying processes.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: March 25, 1986
    Assignee: Sensitisers (Research) Ltd.
    Inventors: Peter B. Readings, Nandor Mihalik, Robin Taylor