Patents by Inventor Andrey N. Cherkasov

Andrey N. Cherkasov 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).

  • THERMALLY, HEAT AND CHEMICALLY RESISTANT ULTRAFILTRATION POLYIMIDE MEMBRANE AND METHOD FOR ITS PRODUCTION
    Publication number: 20120234750
    Abstract: A thermally, heat and chemically stable polyimide asymmetric ultrafiltration membrane, is a porous film or a hollow fiber, having an anisotropic structure a selective surface layer and a substrate, wherein the selective ultraporous surface layer has size of pores 70-800 ? with thickness 0.1-10 mcm and is composed of insoluble rigid-chain aromatic (co)polyimide based on dianhydride of aromatic tetracarbonic acid and aromatic diamine and located on the microporous substrate with thickness 50-250 mcm, and the membrane has water permeability Q=(2-500)·10?4 cm/sec atm and nominal molecular weight cutoff ML=(5-500)·103 g/mol, and method for producing an ultrafiltration membrane as disclosed.
    Type: Application
    Filed: May 30, 2012
    Publication date: September 20, 2012
    Inventors: Galina A. Polotskaya, Tamara K. Meleshko, Alexandr E. Polotsky, Andrey N. Cherkasov
  • Thermally, heat and chemically resistant ultrafiltration polyimide membrane and method for its production
    Patent number: 8210361
    Abstract: A thermally, heat and chemically stable polyimide asymmetric ultrafiltration membrane, is a porous film or a hollow fiber, having an anisotropic structure a selective surface layer and a substrate, wherein the selective ultraporous surface layer has size of pores 70-800 ? with thickness 0.1-10 mcm and is composed of insoluble rigid-chain aromatic (co)polyimide based on dianhydride of aromatic tetracarbonic acid and aromatic diamine and located on the microporous substrate with thickness 50-250 mcm, and the membrane has water permeability Q=(2?500)·10?4 cm/sec atm and nominal molecular weight cutoff ML=(5?500)·103 g/mol, and method for producing an ultrafiltration membrane as disclosed.
    Type: Grant
    Filed: September 18, 2007
    Date of Patent: July 3, 2012
    Inventors: Galina A. Polotskaya, Tamara K. Meleshko, Alexandr E. Polotsky, Andrey N. Cherkasov
  • Thermally, Heat and Chemically Resistant Ultrafiltration Polyimide Membrane and Method for its Production
    Publication number: 20090107908
    Abstract: A thermally, heat and chemically stable polyimide asymmetric ultrafiltration membrane, is a porous film or a hollow fiber, having an anisotropic structure a selective surface layer and a substrate, wherein the selective ultraporous surface layer has size of pores 70-800 ? with thickness 0.1-10 mcm and is composed of insoluble rigid-chain aromatic (co)polyimide based on dianhydride of aromatic tetracarbonic acid and aromatic diamine and located on the microporous substrate with thickness 50-250 mcm, and the membrane has water permeability Q=(2-500)·10?4 cm/sec atm and nominal molecular weight cutoff ML=(5-500)·103 g/mol, and method for producing an ultrafiltration membrane as disclosed.
    Type: Application
    Filed: September 18, 2007
    Publication date: April 30, 2009
    Inventors: Galina A. Polotskaya, Tamara K. Meleshko, Alexandr E. Polotsky, Andrey N. Cherkasov