Patents by Inventor Begum Tokay

Begum Tokay 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).

  • High flux SAPO-34 membranes for CO/CHseparation and template removal method
    Patent number: 8679227
    Abstract: The present invention provides methods for making improved zeolite and crystalline silicoaluminophosphate (SAPO) membranes, in particular SAPO-34 membranes, on a porous support through improved removal of the organic structure-directing templating agent. A calcining step is performed in an oxygen free atmosphere, such as under a vacuum or inert gas, to remove the organic templating agent. By removing the templating agent in the absence of oxygen, the calcination step can remove a greater amount of the templating agent than comparable template removal steps conducted in the presence of oxygen and the calcination step can be conducted at significantly lower temperatures. The membranes of the present invention provide increased permeance while maintaining comparable selectivity for gas separations, particularly carbon dioxide (CO2) and methane (CH4) separations and separations at high temperatures.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: March 25, 2014
    Assignee: The Regents of the University of Colorado
    Inventors: John L. Falconer, Richard D. Noble, Begum Tokay, Yanfeng Zhang
  • HIGH FLUX SAPO-34 MEMBRANES FOR CO2/CH4 SEPARATION AND TEMPLATE REMOVAL METHOD
    Publication number: 20120006194
    Abstract: The present invention provides methods for making improved zeolite and crystalline silicoaluminophosphate (SAPO) membranes, in particular SAPO-34 membranes, on a porous support through improved removal of the organic structure-directing templating agent. A calcining step is performed in an oxygen free atmosphere, such as under a vacuum or inert gas, to remove the organic templating agent. By removing the templating agent in the absence of oxygen, the calcination step can remove a greater amount of the templating agent than comparable template removal steps conducted in the presence of oxygen and the calcination step can be conducted at significantly lower temperatures. The membranes of the present invention provide increased permeance while maintaining comparable selectivity for gas separations, particularly carbon dioxide (CO2) and methane (CH4) separations and separations at high temperatures.
    Type: Application
    Filed: April 28, 2011
    Publication date: January 12, 2012
    Applicant: The Regents of the University of Colorado, a body corporate
    Inventors: John L. Falconer, Richard D. Noble, Begum Tokay, Yanfeng Zhang