Patents by Inventor Walter H. Delphin

Walter H. Delphin 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).

  • Extrudable acrylic compositions
    Patent number: 8309671
    Abstract: A novel extrudable acrylic composition having suitable physical and chemical resistance properties may also be thermoformable. Specific resistance to solvent crazing is desirable. Such compositions can be formed using a combination of a multifunctional chain transfer agent and a multifunctional crosslinking agent.
    Type: Grant
    Filed: October 13, 2006
    Date of Patent: November 13, 2012
    Assignee: Lucite International, Inc.
    Inventors: Andrew Janowicz, Walter H. Delphin, Connie D. Dickerson
  • EXTRUDABLE ACRYLIC COMPOSITIONS
    Publication number: 20100036047
    Abstract: A novel extrudable acrylic composition having suitable physical and chemical resistance properties may also be thermoformable. Specific resistance to solvent crazing is desirable. Such compositions can be formed using a combination of a multifunctional chain transfer agent and a multifunctional crosslinking agent.
    Type: Application
    Filed: October 13, 2006
    Publication date: February 11, 2010
    Applicant: LUCITE INTERNATIONAL, INC.
    Inventors: Andrew Janowicz, Walter H. Delphin, Connie D. Dickerson
  • Acrylic compositions
    Patent number: 5880207
    Abstract: Acrylic compositions are provided which comprise a matrix of polymethyl methacrylate having dispersed within it particles comprising 75 to 90 weight percent of polymethyl methacrylate and greater than 10 to 25 weight percent of a comonomer comprising an ethylenically unsaturated monomer that copolymerizes with methyl methacrylate, wherein the particles further comprise more than 0.4 weight percent of a crosslinker.
    Type: Grant
    Filed: October 17, 1995
    Date of Patent: March 9, 1999
    Assignee: ICI Acrylics Inc.
    Inventors: Walter H. Delphin, Marcia O. Leach, James R. Leach, Fareeduddin Farooq, Connie D. Dickerson
  • Process for manufacture of polymethyl methacrylate sheet with controlled color
    Patent number: 4948546
    Abstract: AB dispersants made by group transfer polymerization aid in controlling color shift during casting of MMA polymer sheet containing color pigments and additives, particularly chain transfer agent and sheet release agent.
    Type: Grant
    Filed: December 2, 1988
    Date of Patent: August 14, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Walter H. Delphin, Clyde S. Hutchins, Robert J. Buchacek
  • Method for the recovery of actinide elements from nuclear reactor waste
    Patent number: 4162230
    Abstract: A process for partitioning and recovering actinide values from acidic waste solutions resulting from reprocessing of irradiated nuclear fuels by adding hydroxylammonium nitrate and hydrazine to the waste solution to adjust the valence of the neptunium and plutonium values in the solution to the +4 oxidation state, thus forming a feed solution and contacting the feed solution with an extractant of dihexoxyethyl phosphoric acid in an organic diluent whereby the actinide values, most of the rare earth values and some fission product values are taken up by the extractant. Separation is achieved by contacting the loaded extractant with two aqueous strip solutions, a nitric acid solution to selectively strip the americium, curium and rare earth values and an oxalate solution of tetramethylammonium hydrogen oxalate and oxalic acid or trimethylammonium hydrogen oxalate to selectively strip the neptunium, plutonium and fission product values.
    Type: Grant
    Filed: December 28, 1977
    Date of Patent: July 24, 1979
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: E. Philip Horwitz, Walter H. Delphin, George W. Mason
  • Method for recovering palladium and technetium values from nuclear fuel reprocessing waste solutions
    Patent number: 4162231
    Abstract: A method for recovering palladium and technetium values from nuclear fuel reprocessing waste solutions containing these and other values by contacting the waste solution with an extractant of tricaprylmethylammonium nitrate in an inert hydrocarbon diluent which extracts the palladium and technetium values from the waste solution. The palladium and technetium values are recovered from the extractant and from any other coextracted values with a strong nitric acid strip solution.
    Type: Grant
    Filed: December 28, 1977
    Date of Patent: July 24, 1979
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: E. Philip Horwitz, Walter H. Delphin