Patents by Inventor Steven Paul Wilkinson

Steven Paul Wilkinson 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).

  • Surfactants for use in liquid/supercritical CO.sub.2
    Patent number: 5789505
    Abstract: Acetylenic alcohols and diols have been found which are soluble in liquid/supercritical CO.sub.2 and exhibit surface active properties. These alcohols and diols act as surfactants by lowering the surface tension between CO.sub.2 and mobile CO.sub.2 -phobic substances which are contacted with the CO.sub.2.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: August 4, 1998
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Steven Paul Wilkinson, Frank Kenneth Schweighardt, Lloyd Mahlon Robeson
  • Surfactants for heterogeneous processes in liquid or supercritical CO.sub.2
    Patent number: 5733964
    Abstract: Heterogeneous polymer mixtures comprising a polymer in liquid or supercritical CO.sub.2 are stabilized by employing a poly(propylene oxide) or poly(butylene oxide) based surfactant. These surfactants are especially well suited for stabilizing heterogeneous polymer mixtures formed by micronizing techniques as well as by precipitation of a compressed fluid antisolvent applications.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: March 31, 1998
    Assignees: Board of Regents, The University of Texas System, Air Products and Chemicals, Inc.
    Inventors: Keith P. Johnston, Steven Paul Wilkinson, Mark Leonard O'Neill, Lloyd Mahlon Robeson, Simon Mawson, Richard Henry Bott, Carrington Duane Smith
  • Powder coatings of amine-reactive resins and amine carbamate salts
    Patent number: 5726251
    Abstract: A method is described wherein a compound containing amine functionality is reacted in its liquid form with carbon dioxide to convert the compound into a solid amine carbamate salt for use as a blocked amine curative in powder coating manufacturing and resulting powder coating operations. The blocked amine curative decomposes on heating and reverts back to a liquid amine providing a highly reactive curative and flow modifier for powder coating applications.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: March 10, 1998
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Steven Paul Wilkinson, Jeffrey Thomas DePinto
  • Process for preparing water dispersible polymer powders
    Patent number: 5688870
    Abstract: Water dispersible polymeric powders are prepared in liquid/supercritical CO.sub.2 by the sequential polymerization of a water soluble polymer after the polymerization of a non-water soluble polymer using core-shell polymerization technology.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: November 18, 1997
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Steven Paul Wilkinson, Lloyd Mahlon Robeson