US20040232080 Variable flow rate injector

Settings

Stemming

Single Family Member

Include NPL

Feedback

Goto Application

Office

United States of America

Application Number 10441640

Application Date 20.05.2003

Publication Number 20040232080

Publication Date 25.11.2004

Grant Number 6962658

Grant Date 08.11.2005

Publication Kind B2

IPC

CPC

Applicants Eksigent Technologies, LLC

Inventors Neyer David W.
Rakestraw David J.
Rehm Jason E.

Agents Sheldon & Mak
Sheldon Jeffrey G.

Priority Data 10441640 20.05.2003 US

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.

B	PERFORMING OPERATIONS; TRANSPORTING
01	PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D	SEPARATION
15	Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
08	Selective adsorption, e.g. chromatography

G	PHYSICS
01	MEASURING; TESTING
N	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
30	Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography

G	PHYSICS
01	MEASURING; TESTING
N	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
30	Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography
02	Column chromatography
04	Preparation or injection of sample to be analysed
16	Injection

G	PHYSICS
01	MEASURING; TESTING
N	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
30	Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography
02	Column chromatography
26	Conditioning of the fluid carrier; Flow patterns
28	Control of physical parameters of the fluid carrier
32	of pressure or speed

B	PERFORMING OPERATIONS; TRANSPORTING
01	PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
D	SEPARATION
15	Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
08	Selective adsorption, e.g. chromatography

Processing

National Phase Entries

Authority File

Settings

Feedback

Goto Application

1. US20040232080 - Variable flow rate injector

Y	SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10	TECHNICAL SUBJECTS COVERED BY FORMER USPC
T	TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
436	Chemistry: analytical and immunological testing
25	including sample preparation
2575	Volumetric liquid transfer