US 12,140,576 B2
Multi-dimensional chromatography modulator with variable modulation period
David Jesse Borton, St. Joseph, MI (US); Jonelle Ley Shiel, Stevensville, MI (US); and Mark Firmer Merrick, Bridgman, MI (US)
Assigned to LECO Corporation, St. Joseph, MI (US)
Filed by LECO Corporation, St. Joseph, MI (US)
Filed on Mar. 12, 2024, as Appl. No. 18/602,959.
Application 18/602,959 is a continuation of application No. 17/423,090, abandoned, previously published as PCT/US2020/013989, filed on Jan. 17, 2020.
Claims priority of provisional application 62/793,509, filed on Jan. 17, 2019.
Prior Publication US 2024/0219357 A1, Jul. 4, 2024
Int. Cl. G01N 30/46 (2006.01); G01N 30/16 (2006.01); G01N 30/88 (2006.01); G01N 30/02 (2006.01)
CPC G01N 30/463 (2013.01) [G01N 30/16 (2013.01); G01N 30/88 (2013.01); G01N 2030/025 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multi-dimensional gas chromatograph for analyzing compounds in a sample during a single run, the chromatograph comprising:
a first column;
a second column; and
a modulator disposed between the first column and the second column, the modulator modulating with (i) a first modulation period over a first time period during the run and (ii) a second modulation period over a second time period during the run later than the first time period, the second modulation period varying over the second time period.