US4332172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for determining the pore water pressure in a soil
Assignee: Individual
•
Filing: 1979-05-22
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Granted: 1982-06-01
•
Expires: 1999-05-22
Abstract
Abstract A device for measuring pore water pressure in soils employs a pore pressure sound (2) as a sensing member and a closed measuring system (5,6) for creating the least possible disturbance in soils having a low degree of permeability, such as clay. The closed liquid-filled measuring system comprises a hypodermic needle type (20) of connection between the pore pressure sound and a measuring device (3), said needle being operative to penetrate a member of resilient material to extend into a liquid-filled chamber in said pore pressure sound and transfer a reading of the pore water pressure to said measuring device.
Inventors
- 👤 Bengt-Arne Torstensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:54
CPC Classifications
E; E02; E02D; E02D1/00; E02D1/02; E02D1/027; E21; E21B; E21B47/00; E21B47/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
143 words
A device for determining the pore water pressure in a soil comprising a water-filled tube, a pore pressure sound at the bottom end of the tube having a filter, a measuring device with a pressure meter, means for connecting the measuring device to the pore pressure sound, cable means for connecting the measuring device to a recording means, the means for connecting the measuring device to the pore pressure sound comprises a hypodermic needle and a member of a resilient material, whereby to record a reading of the pore water pressure the hypodermic needle penetrates said member of resilient material, and damping means arranged on the pore pressure sound below said member for absorbing the effects of a momentary volume change in the pore pressure sound occurring during penetration of the needle through the resilient member, said damping means including a confined gas.
Claim 2
Independent Claim
143 words
A device for determining the pore water pressure in a soil comprising a water-filled tube, a pore pressure sound at the bottom end of the tube having a filter, a measuring device with a pressure meter, means for connecting the measuring device to the pore pressure sound, cable means for connecting the measuring device to a recording means, the means for connecting the measuring device to the pore pressure sound comprises a hypodermic needle and a member of a resilient material, whereby to record a reading of the pore water pressure the hypodermic needle penetrates said member of resilient material, and damping means arranged on the pore pressure sound below said member for absorbing the effects of a momentary volume change in the pore pressure sound occurring during penetration of the needle through the resilient member, said damping means including a confined gas.
Claim 3
Dependent Claim
27 words
A device according to claim 1, wherein the hypodermic needle is provided at the measuring device, and the resilient member is connected to the pore pressure sound.
Claim 4
Dependent Claim
32 words
A device according to claim 2, further comprising an alignment sleeve surrounding the hypodermic needle, said sleeve being coupled on measuring to a nipple which is connected to the pore pressure sound.
Claim 5
Dependent Claim
32 words
A device according to claim 3, wherein the damping means is arranged on the nipple and includes means for enclosing on filling with liquid a predetermined volume of air in said nipple.
Claim 6
Dependent Claim
15 words
A device according to claim 4, wherein the air-enclosing means comprises a sleeve opening downwards.
Claim 7
Dependent Claim
34 words
A device according to claim 1, wherein the member of a resilient material comprises a rubber-cork which is mounted with a pre-tension radially with respect to the longitudinal axis of the pore pressure sound.
Claim 8
Dependent Claim
15 words
A device according to claim 1, wherein the pore pressure sound is a thermoplastic material.
Claim 9
Dependent Claim
18 words
A device according to claim 1, wherein the filter at the pore pressure sound is a ceramic material.
Claim 10
Independent Claim
155 words
A device for determining the pore water pressure in a soil comprising a water-filled tube, a pore pressure sound at the bottom end of the tube having a filter, a measuring device with a pressure meter, means for connecting the measuring device to the pore pressure sound, cable means for connecting the measuring device to a recording means, the means for connecting the measuring device to the pore pressure sound comprises a hypodermic needle and a member of a resilient material, whereby to record a reading of the pore water pressure the hypodermic needle penetrates said member of resilient material, damping means for absorbing the effects of a momentary volume change in the pore pressure sound occurring during penetration of the needle through the resilient member, the hypodermic needle is mounted on a piston nipple which engages sealingly the inside of a cylinder and is displaceable in the cylinder, and said cylinder encloses a cavity.
Claim 11
Independent Claim
155 words
A device for determining the pore water pressure in a soil comprising a water-filled tube, a pore pressure sound at the bottom end of the tube having a filter, a measuring device with a pressure meter, means for connecting the measuring device to the pore pressure sound, cable means for connecting the measuring device to a recording means, the means for connecting the measuring device to the pore pressure sound comprises a hypodermic needle and a member of a resilient material, whereby to record a reading of the pore water pressure the hypodermic needle penetrates said member of resilient material, damping means for absorbing the effects of a momentary volume change in the pore pressure sound occurring during penetration of the needle through the resilient member, the hypodermic needle is mounted on a piston nipple which engages sealingly the inside of a cylinder and is displaceable in the cylinder, and said cylinder encloses a cavity.
Claim 12
Independent Claim
183 words
A device for determining the pore water pressure in a soil comprising a water-filled tube, a pore pressure sound at the bottom end of the tube having a filter, a measuring device with a pressure meter, means for connecting the measuring device to the pore pressure sound, cable means for connecting the measuring device to a recording means, the means for connecting the measuring device to the pore pressure sound comprises a hypodermic needle and a member of a resilient material, whereby to record a reading of the pore water pressure the hypodermic needle penetrates said member of resilient material, damping means for absorbing the effects of a momentary volume change in the pore pressure sound occurring during penetration of the needle through the resilient member, the hypodermic needle is provided at the measuring device, and the resilient member is connected to the pore pressure sound, an alignment sleeve surrounding the hypodermic needle, said sleeve being coupled on measuring to a nipple which is connected to the pore pressure sound, the nipple is connected to the pore pressure sound over a secondary nipple.
Claim 13
Independent Claim
183 words
A device for determining the pore water pressure in a soil comprising a water-filled tube, a pore pressure sound at the bottom end of the tube having a filter, a measuring device with a pressure meter, means for connecting the measuring device to the pore pressure sound, cable means for connecting the measuring device to a recording means, the means for connecting the measuring device to the pore pressure sound comprises a hypodermic needle and a member of a resilient material, whereby to record a reading of the pore water pressure the hypodermic needle penetrates said member of resilient material, damping means for absorbing the effects of a momentary volume change in the pore pressure sound occurring during penetration of the needle through the resilient member, the hypodermic needle is provided at the measuring device, and the resilient member is connected to the pore pressure sound, an alignment sleeve surrounding the hypodermic needle, said sleeve being coupled on measuring to a nipple which is connected to the pore pressure sound, the nipple is connected to the pore pressure sound over a secondary nipple.
Claim 14
Independent Claim
183 words
A device for determining the pore water pressure in a soil comprising a water-filled tube, a pore pressure sound at the bottom end of the tube having a filter, a measuring device with a pressure meter, means for connecting the measuring device to the pore pressure sound, cable means for connecting the measuring device to a recording means, the means for connecting the measuring device to the pore pressure sound comprises a hypodermic needle and a member of a resilient material, whereby to record a reading of the pore water pressure the hypodermic needle penetrates said member of resilient material, damping means for absorbing the effects of a momentary volume change in the pore pressure sound occurring during penetration of the needle through the resilient member, the hypodermic needle is provided at a measuring device, and the resilient member is connected to the pore pressure sound, an alignment sleeve surrounding the hypodermic needle, said sleeve being coupled on measuring to a nipple which is connected to the pore pressure sound, the nipple is connected to the pore pressure sound over a flexible tube.
Claim 15
Independent Claim
183 words
A device for determining the pore water pressure in a soil comprising a water-filled tube, a pore pressure sound at the bottom end of the tube having a filter, a measuring device with a pressure meter, means for connecting the measuring device to the pore pressure sound, cable means for connecting the measuring device to a recording means, the means for connecting the measuring device to the pore pressure sound comprises a hypodermic needle and a member of a resilient material, whereby to record a reading of the pore water pressure the hypodermic needle penetrates said member of resilient material, damping means for absorbing the effects of a momentary volume change in the pore pressure sound occurring during penetration of the needle through the resilient member, the hypodermic needle is provided at a measuring device, and the resilient member is connected to the pore pressure sound, an alignment sleeve surrounding the hypodermic needle, said sleeve being coupled on measuring to a nipple which is connected to the pore pressure sound, the nipple is connected to the pore pressure sound over a flexible tube.
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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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |