Boots – shoes – and leggings
Patent
1997-05-06
1999-08-03
Gordon, Paul P.
Boots, shoes, and leggings
210635, G06F 1700
Patent
active
059333570
ABSTRACT:
A method where the relationship between the observed retention time and the applied carrier gas pressure can be fitted to an expected theoretical relationship and thus enable the retention time on just the precolumn to be precisely derived. This method, used in conjunction with a dual column gas chromatography system having a precolumn, a separation column and programmable pneumatic controls to enable the inlet and midpoint pressures of the system to be independently adjusted, facilitates the use of dual-column backflush techniques without the need for a second detector or for any replumbing in order to connect the first column directly to the detector.
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patent: 5109710 (1992-05-01), Newkirk et al.
patent: 5242471 (1993-09-01), Markham et al.
Muto Hiroyuki, Setting Method of Back Flash Time, Nov. 1992, Patent Abstracts of Japan, Public. #06148158/5/27/94.
Michael Akard & Richard Sacks, Analytical Chemistry, vol. 66, No. 19, Oct. 1, 1994, pp. 3036-3041; Pressure-Tunable Selectivity for High-Speed Gas Chromatography.
T. Hevesi & J. Krupcik, Use of chromatographic models for computerized optimization of coupling-point pressure in dual-column gas chromatography; Journal of Chromatography, Sep. 26, 1990, Amsterdam, NL, pp. 161-173.
Aker David
Gordon Paul P.
Marc McDieunel
The Perkin-Elmer Corporation
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