05205845 is referenced by 27 patents and cites 17 patents.

Several embodiments of gas chromatography systems are disclosed incorporating mechanical sample injection valves. The injection valves incorporate a delivery tube having an outlet which is swept past the inlet of a separation column to provide a short duration inlet plug into the separation column. Carrier gas and sample gas flow is managed through the valve to prevent inadvertent injection after an injection is desired and to assure that the sample is not contaminated by past sample flow. Embodiments of injections valve are described for providing inputs into several gas chromatography columns. In addition, a gas chromatography system is described in which multiple columns are used which are time multiplexed with a single detector to produce a complex combined chromatogram from the plural columns. By appropriate selection of column characteristics and injection sequence, the resulting chromatogram can provide an overlay of chromatograms which provide good resolution of all the constituents of the mixture of interest within a short analysis time.

Title
Mechanical gas chromatography injection valves and column multiplexing techniques
Application Number
717356
Publication Number
5205845
Application Date
January 6, 1992
Publication Date
April 27, 1993
Inventor
Anita J Peters
Ypsilanti
MI, US
Richard D Sacks
Ann Arbor
MI, US
Agent
Harness Dickey & Pierce
Assignee
The Regents of the University of Michigan
MI, US
IPC
B01D 15/08
View Original Source