US4286457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscosity measurement
Assignee: Shell USA Inc
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Filing: 1980-03-06
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Granted: 1981-09-01
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Expires: 2000-03-06
Abstract
Abstract A method and apparatus for determining the solution viscosity of polymers using gel partition chromatography (GPC). The method comprises obtaining a GPC analysis of the solution and measuring the pressure drop at a selected point in the GPC flow path. The GPC analysis provides a measure of the polymer concentration in the solution. The viscosity can be determined from the pressure drop in combination with the known polymer concentration.
Inventors
- 👤 Henry W. Johnson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:20
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/02; G01N11/04; G01N11/08; G01N30/00; G01N30/02; G01N30/62; G01N2030/621; G01N2030/625; G01N30/26; G01N30/28; G01N30/32; G01N33/00; G01N33/44; G01N33/442
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A method for determining the solution viscosity of a polymer comprising: performing a gel partition chromatography analysis of the polymer solution; measuring the pressure drop in the flow line to the chromatography column caused by the passage of said polymer solution; and, recording both said analysis and pressure drop in a correlatable manner.
Claim 2
Independent Claim
53 words
A method for determining the solution viscosity of a polymer comprising: performing a gel partition chromatography analysis of the polymer solution; measuring the pressure drop in the flow line to the chromatography column caused by the passage of said polymer solution; and, recording both said analysis and pressure drop in a correlatable manner.
Claim 3
Dependent Claim
18 words
The method of claim 1 and in addition diluting and filtering the polymer before measuring the pressure drop.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein both said pressure drop measurement and said analysis are recorded on the same time scale.
Claim 5
Independent Claim
107 words
An apparatus for determining the solution viscosity of a polymer comprising: a chromatography apparatus including means for supplying a solvent stream for diluting a sample of the polymer, means disposed in said solvent stream to control the flow of said solvent at a constant temperature; sample means for supplying a sample of the diluted polymer to the chromatography column; a discharge line for discharging the portion of said solvent and diluted polymer not used as a sample; a capillary disposed in said discharge line to regulate the flow therein; and, a pressure transducer disposed in said discharge line upstream of said capillary to measure the pressure therein.
Claim 6
Independent Claim
107 words
An apparatus for determining the solution viscosity of a polymer comprising: a chromatography apparatus including means for supplying a solvent stream for diluting a sample of the polymer, means disposed in said solvent stream to control the flow of said solvent at a constant temperature; sample means for supplying a sample of the diluted polymer to the chromatography column; a discharge line for discharging the portion of said solvent and diluted polymer not used as a sample; a capillary disposed in said discharge line to regulate the flow therein; and, a pressure transducer disposed in said discharge line upstream of said capillary to measure the pressure therein.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |