US4069157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrafiltration device
Assignee: EIDP Inc
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Filing: 1975-11-20
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Granted: 1978-01-17
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Expires: 1995-11-20
Abstract
Abstract A ceramic support having a multiplicity of parallel passageways therethrough, the passageways being coated with an ultrafiltration membrane, the support having a specific surface area to volume ratio and defined permeability characteristics.
Inventors
- 👤 Fred Wayne Hoover
- 👤 Robert Earl Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:19
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/066
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
An ultrafiltration device comprising an integral support of porous ceramic material having substantially uniformly spaced and axially parallel passageways formed therein and a permselective membrane coated onto the surface of the passageways wherein: a. the surface area (SA) of the passageways in the porous support is about from 300 to 2,000 square meters per cubic meter of support; b. the pores in the support have diameters of about from 2 to 20 microns and the decimal proportion of the volume of the pores of the element material to the total volume occupied by the material (PV) is about from 0.30 to 0.60; c. the decimal proportion of the volume of the support material exclusive of the passageways to the total volume of the support (SV) is about from 0.40 to 0.75; and d. the permeability factor (PF) of the support, defined as PF = PV × SV/SA, is greater than about 1.0 × 10-4 meter.
Claim 2
Dependent Claim
155 words
An ultrafiltration device comprising an integral support of porous ceramic material having substantially uniformly spaced and axially parallel passageways formed therein and a permselective membrane coated onto the surface of the passageways wherein: a. the surface area (SA) of the passageways in the porous support is about from 300 to 2,000 square meters per cubic meter of support; b. the pores in the support have diameters of about from 2 to 20 microns and the decimal proportion of the volume of the pores of the element material to the total volume occupied by the material (PV) is about from 0.30 to 0.60; c. the decimal proportion of the volume of the support material exclusive of the passageways to the total volume of the support (SV) is about from 0.40 to 0.75; and d. the permeability factor (PF) of the support, defined as PF = PV × SV/SA, is greater than about 1.0 × 10-4 meter.
Claim 3
Dependent Claim
21 words
An ultrafiltration device of claim 1 wherein the porous support consists essentially of alumina, zieconia, titania, silica, spinel, aluminosilicate or cordierite.
Claim 4
Dependent Claim
27 words
An ultrafiltration device of claim 1 wherein the membrane consists essentially of a multiplicity of particles having average cross-sectional dimensions of about from 0.002 to 15 microns.
Claim 5
Dependent Claim
18 words
An ultrafiltration device of claim 1 wherein the porous support has the configuration of a right circular cylinder.
Claim 6
Dependent Claim
18 words
An ultrafiltration device of claim 4 wherein the diameter of the cylinder is less than about 15 cm.
Claim 7
Dependent Claim
34 words
An ultrafiltration device of claim 1 wherein the pores exhibit openings with diameters of about from 10 to 17 microns and the void space represents about from 45 to 55% of the displacement volume.
Claim 8
Dependent Claim
12 words
An ultrafiltration device of claim 1 wherein the ceramic material is cordierite.
Claim 9
Dependent Claim
62 words
An ultrafiltration device of claim 1 wherein: a. the surface area of the passageways in the porous support (SA) is about from 400 to 1400 square meters per cubic meter of support; and b. thd decimal proportion of the volume of the pores of the element material to the total volume occupied by the material (PV) is about from 0.45 to 0.55.
References Cited (Backward Citations)
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Cited
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Cited
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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) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |