Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture
Reexamination Certificate
2006-01-31
2011-11-01
Williams, Hezron E (Department: 2856)
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Content or effect of a constituent of a liquid mixture
C137S250000, C251S304000
Reexamination Certificate
active
08047060
ABSTRACT:
The present invention provides a method and apparatus for substantially eliminating destructive transients of pressure or flow rate which can degrade the efficiency and useful lifetime of chromatography columns. The present invention enables a substantially constant flow of mobile phase liquid to be maintained through the chromatography system by eliminating the flow blockage interval associated with the actuation of sample injection valves. The present invention further provides a method to reduce the pressure and flow rate transients associated with pressurization of the sample loop contents when the sample loop is introduced to chromatography system delivery pressure.
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Ciolkosz Theodore D.
Dourdeville Theodore A.
Keene Russell L.
Usowicz James E.
Frank Rodney T
Waters Technologies Corporation
Williams Hezron E
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