Patents by Inventor Barry J. Hartnett

Barry J. Hartnett 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).

  • Solute monitoring process
    Patent number: 4324589
    Abstract: This invention relates to monitoring the concentration of a component dissolved in solution where the component imparts a perceptible color to the solution and varies in concentration with use of the solution.
    Type: Grant
    Filed: January 29, 1980
    Date of Patent: April 13, 1982
    Assignee: Shipley Company Inc.
    Inventors: Michael Gulla, Barry J. Hartnett
  • Self-monitoring electroless plating solution
    Patent number: 4229218
    Abstract: This invention relates to monitoring the concentration of a component dissolved in solution where the component imparts a perceptible color to the solution and varies in concentration with use of the solution.The invention is based upon use of a colorant of a fixed optical density that absorbs light in a different region of the visible spectrum than the monitored component. As the monitored component varies in concentration with use of the solution, the optical density of that component in solution varies as a function of its concentration and consequently, the amount of light, i.e., the intensity of light, passing through the solution will also vary as a function of concentration. Since the optical density of the colorant remains fixed during use, the optical density of the monitored component changes relative to the optical density of the colorant during use of the solution.
    Type: Grant
    Filed: February 5, 1979
    Date of Patent: October 21, 1980
    Assignee: Shipley Company Inc.
    Inventors: Michael Gulla, Barry J. Hartnett