Patents by Inventor Herbert Halpaap

Herbert Halpaap 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).

  • Separating materials for thin layer chromatography and their preparation
    Patent number: 4295968
    Abstract: A separating material for thin-layer chromatography, comprising a substrate material coated with a thin sorbent layer, wherein the sorbent layer optionally contains a binder, an indicator, or both, is improved in that the sorbent layer has a surface modified by reacting the sorbent layer with a silanizing agent without the exclusion of moisture.
    Type: Grant
    Filed: March 20, 1978
    Date of Patent: October 20, 1981
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Herbert Halpaap, Karl-Friedrich Krebs
  • Fluorescent indicators for chromatography and sorption agents containing them
    Patent number: 4235716
    Abstract: Magnesium, calcium, strontium, barium, zinc and/or cadmium tungstate and/or calcium molybdate are good fluorescent indicators for use in sorption agents for chromatography. They are especially useful because of the stability of their fluorescent properties to acidic treatment.
    Type: Grant
    Filed: November 17, 1978
    Date of Patent: November 25, 1980
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Herbert Halpaap, Manfred Eckle, Hubert Rossler
  • Coated carrier materials for thin layer chromatography having a concentrating zone
    Patent number: 4158626
    Abstract: TLC plates having a concentrating zone located adjacent to and before a chromatography layer are improved by using as the layer for the concentrating zone a silicon dioxide of medium pore volume (e.g., 0.5-1.5 ml/g) and a pore width of 2-15 .mu.m.
    Type: Grant
    Filed: May 25, 1978
    Date of Patent: June 19, 1979
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Herbert Halpaap, Karl-Friedrich Krebs, Hans Heinz
  • Separating material for thin layer chromatography
    Patent number: 4064041
    Abstract: A separating material for thin layer chromatography comprising an inert substrate coated with a sorption agent consisting essentially of silica gel particles about 3 to 8 .mu.m in diameter in a layer 100-300 .mu.m thick.
    Type: Grant
    Filed: May 27, 1976
    Date of Patent: December 20, 1977
    Assignee: Merck Patent Gesellschaft mit beschraenkter Haftung
    Inventors: Herbert Halpaap, Walter Reich, Johannes Ripphahn