Patents by Inventor Frederikus J. Logtenberg

Frederikus J. Logtenberg 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).

  • Method and apparatus for the introduction of a volume of at least one fluid in a tube in particular suitable for capillary electrophoresis systems and method and apparatus for separating and/or analyzing a fluid material
    Patent number: 5217590
    Abstract: A method and apparatus for the injection of a quantitatively defined volume of at least one fluid into a tube or capillary, in particular suitable for capillary electrophoresis systems by immersing at least one end of the tube or capillary in the fluid to be injected in the tube or capillary and generating an overpressure in a space above the surface of the fluid to be injected, wherein said overpressure is generated by means of a syringe device comprising a cylinder and a piston movable in a controlled manner in the cylinder, said cylinder being filled with a suitable gas and being connected via a pressure line to said space above the surface of the fluid to be injected.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: June 8, 1993
    Assignee: Lauer Labs B.V.
    Inventors: Hermanus H. Lauer, Jan A. Ooms, Marinus C. Hansen, Frederikus J. Logtenberg, Karel A. Loth