Patents by Inventor Mark Heisler

Mark Heisler 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).

  • Filtration membranes and method of making the same
    Patent number: 5108607
    Abstract: Microporous membranes can be prepared which comprise a polymer which is a hydrophobic polymer in bulk form and which has an equilibrium water absorption from about 2% to about 4%, but is hydrophilic when precipitated as a membrane. The membranes are further characterized by high water flow rates at any given bubble point.
    Type: Grant
    Filed: October 12, 1990
    Date of Patent: April 28, 1992
    Assignee: Gelman Sciences, Inc.
    Inventors: Menaham Kraus, Mark Heisler, Inessa Katsnelson, Diosie Velazques
  • Filtration membranes and method of making the same
    Patent number: 4964990
    Abstract: Microporous membranes can be prepared which comprise a polymer which is a hydrophobic polymer in bulk form and which has an equilibrium water absorption from about 2% to about 4%, but is hydrophilic when precipitated as a membrane. The membranes are further characterized by high water flow rates at any given bubble point.
    Type: Grant
    Filed: January 10, 1990
    Date of Patent: October 23, 1990
    Assignee: Gelman Sciences, Inc.
    Inventors: Menaham Kraus, Mark Heisler, Inessa Katsnelson, Diosie Velazques
  • Polyaldehyde activated membranes
    Patent number: 4961852
    Abstract: An activated microporous membrane is provided, having aldehyde functional groups on its inner and outer surfaces. The aldehyde functionality on all surfaces provides for effective covalent bonding to the membrane by amine containing materials. The activated membrane can be made of a polysulfone/polyacrolein mixture or a polysulfone microporous membrane treated with a polyacrolein solution.
    Type: Grant
    Filed: March 9, 1989
    Date of Patent: October 9, 1990
    Assignee: Gelman Sciences, Inc.
    Inventors: Kanyawasam P. W. Pemawansa, Mark Heisler, Menahem Kraus
  • Filtration membranes and method of making the same
    Patent number: 4900449
    Abstract: Microporous membranes can be prepared which comprise a polymer which is a hydrophobic polymer in bulk form and which has an equilibrium water absorption from about 2% to about 4%, but is hydrophilic when precipitated as a membrane. The membranes are further characterized by high water flow rates at any given bubble point.
    Type: Grant
    Filed: May 20, 1987
    Date of Patent: February 13, 1990
    Assignee: Gelman Sciences
    Inventors: Menaham Kraus, Mark Heisler, Inessa Katsnelson, Diosie Velazques
  • Polyaldehyde activated membranes
    Patent number: 4824870
    Abstract: An activated microporous membrane is provided, having aldehyde functional groups on its inner and outer surfaces. The aldehyde functionally on all surfaces provides for effective covalent bonding to the membrane by amine containing materials. The activated membrane can be made of a polysulfone/polyacrolein mixture or a polysulfone microporous membrane treated with a polyacrolein solution.
    Type: Grant
    Filed: September 14, 1987
    Date of Patent: April 25, 1989
    Assignee: Gelman Sciences, Inc.
    Inventors: Kariyawasam P. W. Pemawansa, Mark Heisler, Menahem Kraus