Patents by Inventor Richard Joseph Kempf

Richard Joseph Kempf 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).

  • Process for using photoimageable films prepared for aqueous photoimageable liquid emulsions
    Patent number: 5741621
    Abstract: A process for preparing an image on a substrate by applying a photoimageable composition on a first substrate, wherein the photoimageable composition, having a solids content from 25 to 60 weight percent, contains a partially neutralized acid-containing polymer formed from a precursor polymer having an acid number from 90 to 160 prior to neutralization and wherein 1 to 15% of acid-containing groups of the precursor polymer are neutralized with base; an ethylenically unsaturated monomer; a photoinitiator or photoinitiating system, water; 0-5% by weight a solution polymer, based on the weight of total polymer present in the composition; and 0-25% by weight of an organic solvent based on the total weight of the organic solvent and water; wherein the liquid composition is present as a stable emulsion, and wherein the liquid composition has a Brookfield viscosity, at 25.degree. C.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: April 21, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Richard Joseph Kempf, John Haetak Choi, Harvey Walter Taylor, Jr.