Patents by Inventor Robert Kesting

Robert Kesting 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).

  • Highly asymmetric ultrafiltration membranes
    Patent number: 5958989
    Abstract: The present invention relates to highly asymmetric polymer membranes for ultrafiltration (UF), and to a simplified method of their manufacture. Disclosed herein are UF membranes with a high degree of asymmetry between the size of pores at the skin face of the membrane and the size of pores at the opposite face of the membrane. Asymmetry ratios of these membranes range from about 20 to about 1000. The porous support layer between the skin face and the opposite face is reticular and is substantially free of macrovoids. These membranes thus have higher flow rates than prior UF membranes. The membranes are cast from polymer dope mixes that are either homogeneous solutions or stable colloidal dispersions.
    Type: Grant
    Filed: July 8, 1997
    Date of Patent: September 28, 1999
    Assignee: USF Filtration and Separations Group, Inc.
    Inventors: I-Fan Wang, Jerome F. Ditter, Richard A. Morris, Robert Kesting
  • Highly asymmetric ultrafiltration membranes
    Patent number: 5928774
    Abstract: The present invention relates to highly asymmetric polymer membranes for ultrafiltration (UF), and to a simplified method of their manufacture. Disclosed herein are UF membranes with a high degree of asymmetry between the size of pores at the skin face of the membrane and the size of pores at the opposite face of the membrane. Asymmetry ratios of these membranes range from about 20 to about 1000. The porous support layer between the skin face and the opposite face is reticular and is substantially free of macrovoids. These membranes thus have higher flow rates than prior UF membranes. The membranes are cast from polymer dope mixes that are either homogeneous solutions or stable colloidal dispersions.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: July 27, 1999
    Assignee: USF Filtration and Separations Group Inc.
    Inventors: I-Fan Wang, Jerome F. Ditter, Richard A. Morris, Robert Kesting