Patents by Inventor Ralf J. Oerschkes

Ralf J. Oerschkes 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).

  • Column-packing material for gel-permation chromatography, method for its preparation, and applications
    Patent number: 5428067
    Abstract: A column packing material to be used in gel permeation chromatography (GPC) consists of support particles with a mean particle diameter of 1 to 50.mu. of which the matrix is formed by an inorganic or organic, polymeric and porous hard material with a mean pore diameter of 6 to 50 nm and a pore volume of 0.1 to 3 ml/g, the matrix pores containing chemically bound polymer chains. The column packing material of the invention is characterized in that the polymer chains consist of linear, permeable and not-crosslinked polymers with an upper exclusion limit between 200 and 200,000, the pores of the matrix being entirely filled by the polymer chains. The method of the invention is characterized in that the pores of the support particles are filled by polymer chains chemically bound to the pore surfaces, these polymer chains being permeable to solvents and partly to dissolved substances.
    Type: Grant
    Filed: November 19, 1992
    Date of Patent: June 27, 1995
    Assignee: Macherey, Nagel & Co.
    Inventors: Gunter Wulff, Milan Minarik, Ralf J. Oerschkes
  • Column-packing material for gel-permation chromatography method for preparation, and applications
    Patent number: 5164427
    Abstract: A column packing material to be used in gel permeation chromatography (GPC) consists of support particles with a mean particle diameter of 1 to 50 .mu. of which the matrix is formed by an inorganic or organic, polymeric and porous hard material with a mean pore diameter of 6 to 50 nm and a pore volume of 0.1 to 3 ml/g, the matrix pores containing chemically bound polymer chains. The column packing material of the invention is characterized in that the polymer chains consist of linear, permeable and not-crosslinked polymers with an upper exclusion limit between 200 and 200,000, the pores of the matrix being entirely filled by the polymer chains. The method of the invention is characterized in that the pores of the support particles are filled by polymer chains chemically bound to the pore surfaces, these polymer chains being permeable to solvents and partly to dissolved substances.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: November 17, 1992
    Assignee: Macherey, Nagel & Co.
    Inventors: Gunter Wulff, Milan Minarik, Ralf J. Oerschkes
  • Column-packing material for gel-permation chromatography, method for its preparation, and applications
    Patent number: 5091433
    Abstract: A column Packing material to be used in gel permeation chromatography (GPC) consists of support particles with a mean particle diameter of 1 to 50 .mu. of which the matrix is formed by an inorganic or organic, polymeric and porous hard material with a mean pore diameter of 6 to 50 nm and a pore volume of 0.1 to 3 ml/g, the matrix pores containing chemically bound polymer chains. The column packing material of the invention is characterized in that the polymer chains consist of linear, permeable and not-crosslinked polymers with an upper exclusion limit between 200 and 200,000, the pores of the matrix being entirely filled by the polymer chains. The method of the invention is characterized in that the pores of the support particles are filled by polymer chains chemically bound to the pore surfaces, these polymer chains being permeable to solvents and partly to dissolved substances.
    Type: Grant
    Filed: October 12, 1990
    Date of Patent: February 25, 1992
    Assignee: Macherey, Nagel & Co.
    Inventors: Gunter Wulff, Milan Minarik, Ralf J. Oerschkes