Patent US3683674A successfully refreshed from Google Patents.
US3683674A
Expired / Lapsed
US
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Measurement of pore size and porosity
Assignee: Trane US Inc
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Filing: 1970-10-15
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Granted: 1972-08-15
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Expires: 1990-10-15
Abstract
Abstract The force required to drive a liquid out of a capillary is dependent upon the diameter of the capillary as well as the surface tension of the liquid and its contact angle with the material of the capillary. If a specimen of a porous material having capillaries is saturated with a liquid and rotated in a centrifuge, the force acting on the liquid is dependent upon the speed and the geometry of rotation. In this apparatus, a sample impregnated with a known liquid is rotated in a predetermined manner at the incremental constant speeds and the volume of liquid driven out of the sample is measured for each speed of rotation. From this information, a size-volume distribution of porosity of the sample and, therefore, of the material from which the sample was derived can be made.
Inventors
- 👤 Salil K Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:45
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/088
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
57 words
A method of determining the size-volume distribution of porosity of a porous member comprising filling the pores of said porous member with a fluid, centrifuging said porous member at a constant speed, measuring the fluid centrifuged out of said porous member, and determining the size of pore cleared of fluid from the speed and fluid centrifuged out.
Claim 2
Independent Claim
57 words
A method of determining the size-volume distribution of porosity of a porous member comprising filling the pores of said porous member with a fluid, centrifuging said porous member at a constant speed, measuring the fluid centrifuged out of said porous member, and determining the size of pore cleared of fluid from the speed and fluid centrifuged out.
Claim 3
Dependent Claim
20 words
The method of claim 1 including the step of measuring the speed at which said porous member is being centrifuged.
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein said fluid in said pores of said porous member comprises a liquid having a known surface tension and contact angle.
Claim 5
Dependent Claim
17 words
The method of claim 3 wherein said fluid in said pores of said porous member comprises water.
Claim 6
Independent Claim
74 words
A method of determining the size-volume distribution of porosity of a porous member comprising filling the pores of said porous member with a fluid, centrifuging said porous member at increasing speeds in incremental steps, measuring the fluid centrifuged out of said porous member at each incremental step of speed, and determining the size-volume distribution of porosity of the porous member from the fluid centrifuged out of the porous member at the various incremental speeds.
Claim 7
Independent Claim
74 words
A method of determining the size-volume distribution of porosity of a porous member comprising filling the pores of said porous member with a fluid, centrifuging said porous member at increasing speeds in incremental steps, measuring the fluid centrifuged out of said porous member at each incremental step of speed, and determining the size-volume distribution of porosity of the porous member from the fluid centrifuged out of the porous member at the various incremental speeds.
Claim 8
Dependent Claim
24 words
The method of claim 5 including the step of measuring the speed of each incremental step at which said porous member is being centrifuged.
Claim 9
Dependent Claim
26 words
The method of claim 6 wherein said fluid in said pores of said porous member comprises a liquid having a known surface tension and contact angle.
Claim 10
Dependent Claim
17 words
The method of claim 6 wherein said fluid in said pores of said porous member comprises water.
Claim 11
Dependent Claim
113 words
Centrifuge mechanism for determining the size-volume distribution of porosity of a porous sample comprising a motor-driven slinger device; at least one sample tube suspended from the slinger device at a location spaced radially away from the slinger drive axis; said tube having an open end for insertion therethrough of a liquid-impregnated sample, a closed liquid-collector end, and a sample-supporting shoulder intermediate the open and closed ends; said tube being connected to the slinger device so that during rotation of the device the tube takes a generally radial position with its closed end disposed outwardly from the sample, whereby liquid in the sample is caused to be centrifugally thrown into the tube closed end.
Claim 12
Dependent Claim
113 words
Centrifuge mechanism for determining the size-volume distribution of porosity of a porous sample comprising a motor-driven slinger device; at least one sample tube suspended from the slinger device at a location spaced radially away from the slinger drive axis; said tube having an open end for insertion therethrough of a liquid-impregnated sample, a closed liquid-collector end, and a sample-supporting shoulder intermediate the open and closed ends; said tube being connected to the slinger device so that during rotation of the device the tube takes a generally radial position with its closed end disposed outwardly from the sample, whereby liquid in the sample is caused to be centrifugally thrown into the tube closed end.
Claim 13
Dependent Claim
40 words
The mechanism of claim 9 wherein the tube wall areas between the sample supporting shoulder and tube closed end are transparent and marked with Graduations to permit visual observation of the amount of liquid collected in the tube closed end.
Claim 14
Dependent Claim
53 words
The mechanism of claim 10 wherein the slinger device is arranged for rotation in a horizontal plane; said slinger device including a rotary tension member, and a tube holder pivotally attached to said tension member so that the tube assumes a generally vertical position for sample loading and a horizontal position during centrifuging.
Claim 15
Dependent Claim
24 words
The mechanism of claim 11 wherein the tube is removably positioned in the holder to permit discharge of the used sample and collected liquid.
References Cited (Backward Citations)
US3380292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |