Method and apparatus for measuring velocity of...

Details Method and apparatus for measuring velocity of... Method and apparatus for measuring velocity of...

2007-08-21

2007-08-21

Smith, Duane (Department: 1724)

Gas separation: processes

Chromatography

C095S087000, C096S101000, C073S023350, C073S023390

Reexamination Certificate

active

10508647

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).

REFERENCES:
patent: 3305000 (1967-02-01), Bullen et al.
patent: 3309504 (1967-03-01), Rosso et al.
patent: 4948389 (1990-08-01), Klein et al.
patent: 5215556 (1993-06-01), Hiller et al.
patent: 5596876 (1997-01-01), Manura et al.
patent: 6190613 (2001-02-01), Watanabe et al.
patent: 2001/0037727 (2001-11-01), Ledford, Jr. et al.

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