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1. US20050236314 - Variable flow rate injector

Office
United States of America
Application Number 11171854
Application Date 29.06.2005
Publication Number 20050236314
Publication Date 27.10.2005
Publication Kind A1
IPC
B01D 15/08
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
15Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
08Selective adsorption, e.g. chromatography
G01N 30/00
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
30Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography
G01N 30/16
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
30Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography
02Column chromatography
04Preparation or injection of sample to be analysed
16Injection
G01N 30/32
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
30Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography
02Column chromatography
26Conditioning of the fluid carrier; Flow patterns
28Control of physical parameters of the fluid carrier
32of pressure or speed
Applicants NEYER DAVID W
RAKESTRAW DAVID J
REHM JASON E
Inventors Neyer David W.
Rakestraw David J.
Rehm Jason E.
Agents SHELDON &; MAK, INC
Title
(EN) Variable flow rate injector
Abstract
(EN)

A variable flow rate injector provides accurate, precise, and reproducible injection volumes that have low dispersion. The invention is particularly well-suited for HPLC injection volumes <;500 nL but can be used to inject larger volumes and in different applications as well. Injections are performed at a first flow rate and separations are performed at a second flow rate. For improved HPLC system performance, the first flow rate is less than the second flow rate. The injector uses a variable flow rate fluid supply that allows rapid switching between flow rates desired for injection and flow rates desired for separations.


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