Patents by Inventor W. Robert Pratt

W. Robert Pratt 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).

  • Method for visual inspection of multilayer printed circuit boards
    Patent number: 4697923
    Abstract: A method is disclosed for the visual inspection of electrical circuitry deposited in the layers of a multilayer printed circuit board wherein the dielectric layers of the multilayer board are prepared using a clear, light transparent thermosetting resin having incorporated therein a dye which is permeable to visible light but which absorbs light in the 320-440 nm region.The electrical circuitry in the board can be easily traced by an observer upon illumination of the board by visible light.
    Type: Grant
    Filed: March 25, 1986
    Date of Patent: October 6, 1987
    Assignee: IBM Corporation
    Inventors: Gerald W. Jones, W. Robert Pratt, William J. Summa
  • Method for treating waste compositions
    Patent number: 4512900
    Abstract: Process for treating liquid waste compositions which contain copper ions and a complexing agent for the copper which includes reducing the concentration of copper ions in the waste composition to less than about 8 ppm and contacting the composition with H.sub.2 O.sub.2 ; and then contacting the waste composition with an ozone-containing gas and irradiating with ultraviolet light.
    Type: Grant
    Filed: December 13, 1983
    Date of Patent: April 23, 1985
    Assignee: International Business Machines Corporation
    Inventors: George J. Macur, W. Robert Pratt, James E. Sharkness