Patents by Inventor Kathleen Jo Pekarek

Kathleen Jo Pekarek 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).

  • Preparation of multiwall polymeric microcapsules from hydrophilic polymers
    Patent number: 6511749
    Abstract: Two or more hydrophilic polymers that are not soluble in each other at a particular concentration and temperature, but which have a positive spreading coefficient in solution, are used to form multi-layered polymeric microspheres. The multi-layer microspheres produced by the method are distinguished by extremely uniform dimensioned polymer layers and actual incorporation of a substance to be delivered into the polymer layers. In the preferred embodiment of the method, two polymers are dissolved in an aqueous solvent, the substance to be incorporated is dispersed or dissolved in the polymer solution, the mixture is suspended in an organic solvent or polymer/water mixture and stirred, and the solvent is slowly evaporated, creating microspheres with an inner core formed by one polymer and an outer layer formed by the second polymer.
    Type: Grant
    Filed: December 15, 1997
    Date of Patent: January 28, 2003
    Assignee: Brown University Research Foundation
    Inventors: Edith Mathiowitz, Jules S. Jacob, Donald E. Chickering, III, Kathleen Jo Pekarek
  • Preparation of multiwall polymeric microcapsules from hydrophilic polymers
    Patent number: 5985354
    Abstract: Two or more hydrophilic polymers that are not soluble in each other at a particular concentration and temperature, but which have a positive spreading coefficient in solution, are used to form multi-layered polymeric microspheres. The multi-layer microspheres produced by the method are distinguished by extremely uniform dimensioned polymer layers and actual incorporation of a substance to be delivered into the polymer layers. In the preferred embodiment of the method, two polymers are dissolved in an aqueous solvent, the substance to be incorporated is dispersed or dissolved in the polymer solution, the mixture is suspended in an organic solvent or polymer/water mixture and stirred, and the solvent is slowly evaporated, creating microspheres with an inner core formed by one polymer and an outer layer formed by the second polymer.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: November 16, 1999
    Assignee: Brown University Research Foundation
    Inventors: Edith Mathiowitz, Jules S. Jacob, Donald E. Chickering, III, Kathleen Jo Pekarek