Patents by Inventor Roza Tizvar

Roza Tizvar 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).

  • Membrane separation at high temperature differential
    Patent number: 9795899
    Abstract: A gaseous species can be separated from an aqueous donor mixture and absorbed in an aqueous recipient mixture using a membrane separation apparatus while maintaining a large temperature difference (e.g. greater than 30° C.) between the two aqueous mixtures. A composite membrane is employed which comprises a non-porous membrane adjacent a porous membrane. The non-porous membrane is permeable to the gaseous species. The porous membrane has a porosity greater than 50% and is hydrophobic. In one embodiment, the composite membrane is oriented such that the porous membrane faces the aqueous recipient mixture and is impermeable thereto at the recipient mixture pressure. The invention is particularly suitable for separating chlorine dioxide from chlorine dioxide reaction liquor and absorbing in chilled water.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: October 24, 2017
    Assignee: Chemetics Inc.
    Inventors: Siamak Lashkari, Thomas Stanley Drackett, David Alexander Summers, Roza Tizvar, Felix Man Fai Mok, Paul Darcy Kozak, Jurgen Erich Hinze
  • MEMBRANE SEPARATION AT HIGH TEMPERATURE DIFFERENTIAL
    Publication number: 20150343330
    Abstract: A gaseous species can be separated from an aqueous donor mixture and absorbed in an aqueous recipient mixture using a membrane separation apparatus while maintaining a large temperature difference (e.g. greater than 30° C.) between the two aqueous mixtures. A composite membrane is employed which comprises a non-porous membrane adjacent a porous membrane. The non-porous membrane is permeable to the gaseous species. The porous membrane has a porosity greater than 50% and is hydrophobic. In one embodiment, the composite membrane is oriented such that the porous membrane faces the aqueous recipient mixture and is impermeable thereto at the recipient mixture pressure. The invention is particularly suitable for separating chlorine dioxide from chlorine dioxide reaction liquor and absorbing in chilled water.
    Type: Application
    Filed: May 26, 2015
    Publication date: December 3, 2015
    Inventors: Siamak Lashkari, Thomas Stanley Drackett, David Alexander Summers, Roza Tizvar, Felix Man Fai Mok, Paul Darcy Kozak, Jurgen Erich Hinze