Patents by Inventor Edward Ledford Jr

Edward Ledford Jr 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 measuring velocity of chromatagraphic pulse
    Publication number: 20050139076
    Abstract: An Apparatus and method for two-stage chromatographic separation uses thermal modulation. The chromatographic column or modulation tube (1) has a loop structure such that two portions of modulation tube (1) can be thermally modulated simultaneously by at least one thermal modulation device, which device can have a cold gas source, jet tube (2), and a hot gas source, hot jet tube (5), to modulate the temperature of the portions (3, 4) of modulation tube (1).
    Type: Application
    Filed: March 19, 2002
    Publication date: June 30, 2005
    Inventor: Edward Ledford Jr