Patents by Inventor Daniel Joseph Hart

Daniel Joseph Hart 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).

  • Stable, ionomeric photoresist emulsion and process of preparation and use thereof
    Patent number: 5981147
    Abstract: Disclosed are waterborne, stable photoresist compositions and methods of their preparation and use. The compositions are characterized by increased shear and storage stability. The photoresist composition comprises an aqueous emulsion of a 22% or less neutralized carboxylated resin and non-ionic surfactant containing poly(ethylene-oxide) segments, photopolymerizable monomer and photoinitiator. Neutralization is accomplished using either an organic or an inorganic base or mixtures thereof. The photoresist compositions are useful to selectively coat and protect surfaces subjected to corrosive environments, e.g., etchant processes, in the production of circuit traces for electronic circuit boards.
    Type: Grant
    Filed: April 8, 1997
    Date of Patent: November 9, 1999
    Assignee: Mac Dermid Incorporated
    Inventors: John Scott Hallock, Alan Frederick Becknell, Cynthia Louise Ebner, Daniel Joseph Hart