US4478071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscosimeter operating continuously especially at high temperature
Assignee: Societe National Elf Aquitaine
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Filing: 1982-12-21
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Granted: 1984-10-23
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Expires: 2002-12-21
Abstract
Abstract The present invention concerns a viscosimeter adapted to operate continuously, comprising a measuring capillary in which the liquid phase whose viscosity is measured undergoes a loss of pressure. It is characterized in that the measuring capillary (17) consists of a tube of several meters length, wound around itself according to a helix having a diameter of at least 10 cm, the internal diameter of the tube being substantially comprised between 0.20 and 0.30 mm, and in that a sensor for measuring the loss of pressure consists of two identical pressure sensors (22,23) positioned at the entry and at the exit of the capillary (17) for differentially measuring the loss of pressure in this capillary.
Inventors
- 👤 Didier Lecacheux
- 👤 James Lesec
- 👤 Roland Prechner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:35
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/02; G01N11/04; G01N30/00; G01N30/02; G01N30/62
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
Viscosimeter designed for continuous operation, comprising a measuring capillary in which the liquid phase whose viscosity is measured, undergoes a loss of pressure, the measuring capillary consisting of a tube having a length of several meters, wound around itself in the form of a helix having a diameter of at least 10 cm, the internal diameter of the said tube being substantially between 0.20 and 0.30 mm, and means of measuring the said loss of pressure said measuring means comprising two pressure sensors positioned at the entry and at the exit of the said capillary, for differential measurement of the loss of pressure in the capillary.
Claim 2
Dependent Claim
106 words
Viscosimeter designed for continuous operation, comprising a measuring capillary in which the liquid phase whose viscosity is measured, undergoes a loss of pressure, the measuring capillary consisting of a tube having a length of several meters, wound around itself in the form of a helix having a diameter of at least 10 cm, the internal diameter of the said tube being substantially between 0.20 and 0.30 mm, and means of measuring the said loss of pressure said measuring means comprising two pressure sensors positioned at the entry and at the exit of the said capillary, for differential measurement of the loss of pressure in the capillary.
Claim 3
Dependent Claim
16 words
A viscosimeter according to claim 1, wherein the measuring capillary is arranged in a thermostatically-controlled bath.
Claim 4
Dependent Claim
18 words
A viscosimeter according to claim 1, wherein said viscosimeter is placed inside an oven maintained at high temperature.
Claim 5
Dependent Claim
19 words
A viscosimeter according to claim 3, wherein the temperature is in the range of 150° C., for measuring polyolefins.
Claim 6
Dependent Claim
37 words
A viscosimeter according to claim 1, 2, 3 or 4, wherein the diameter of the helix of the capillary is at least 10 cm, its internal diameter is 0.27 mm and its total length about 3 m.
Claim 7
Dependent Claim
24 words
A viscosimeter according to claim 1, 2, 3 or 4, wherein the diameter of the helix of the capillary is greater than 16 cm.
Claim 8
Dependent Claim
43 words
A viscosimeter according to claim 1, 2, 3 or 4, wherein the pressure sensors, are connected to two terminals upstream and downstream from the measuring capillary, by two T-connectors into which lead respectively the delivery and discharge conduits of the measured liquid phase.
Claim 9
Dependent Claim
28 words
A viscosimeter according to claim 1, 2, 3 or 4, wherein the pressure sensors are associated with a device for processing signals that they deliver, comprising an amplifier.
Claim 10
Dependent Claim
76 words
An installation for continuous measurement of the viscosity of a liquid phase exiting from a liquid chromatography column, in liquid phase, the column being provided with a pump and a nozzle, the installation comprising a viscosimeter according to claim 1, 2, 3 or 4, wherein the exit of the column is connected to the entry of the measuring capillary, the indications of the pressure sensors being transmitted to an information processing chain integrated to the installation.
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |