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Patent US4212733A successfully refreshed from Google Patents.
US4212733A
Expired / Lapsed
US
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Oil-water separation filters
Assignee: Somar Corp
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Filing: 1977-12-27
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Granted: 1980-07-15
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Expires: 1997-12-27
Abstract
Abstract An oil-water separation filter, which comprises (1) a porous material comprising a sintered polyethylene powder bonded to (2) a fibrous layer having a thickness of about 0.5 to about 5 mm and a porosity of about 70 to about 90% comprising fibers having a water content of about 0.4 to about 5%, a critical surface tension of about 25 to about 45 dyne/cm and a fiber diameter of about 5 to about 30 μ or a mixture of the fibers and fibers having a water content of about 8 to about 15% and a fiber diameter of 5 to about 30 μ.
Inventors
- 👤 Yuzuru Goto
- 👤 Yukitaka Daigo
- 👤 Mikio Hitotsuyanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:45
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1638; B01D39/1653; B01D39/1661; B01D17/00; B01D17/02; B01D17/04; B01D17/045; B01D17/08; B01D17/10; B01D39/1607; B01D39/1623; B01D39/163; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249986
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
An oil-water separation filter, which comprises (i) a first filter layer of a porous base material and (ii) a second fibrous filter layer, said first filter layer (i) being bonded to said second fibrous filter layer (ii), said base material comprising a sintered polyethylene powder and said fibrous filter layer having a thickness of about 0.5 to about 5 mm and a porosity of about 70 to about 90% and being comprised of (a) fibers having a water content of about 0.4 to about 5%, a critical surface tension of about 25 to about 45 dyne/cm and a fiber diameter of about 5 to about 30μ or being comprised of (b) a mixture of said fibers (a) and fibers having a water content of about 8 to about 15% and a fiber diameter of 5 to about 30μ.
Claim 2
Dependent Claim
138 words
An oil-water separation filter, which comprises (i) a first filter layer of a porous base material and (ii) a second fibrous filter layer, said first filter layer (i) being bonded to said second fibrous filter layer (ii), said base material comprising a sintered polyethylene powder and said fibrous filter layer having a thickness of about 0.5 to about 5 mm and a porosity of about 70 to about 90% and being comprised of (a) fibers having a water content of about 0.4 to about 5%, a critical surface tension of about 25 to about 45 dyne/cm and a fiber diameter of about 5 to about 30μ or being comprised of (b) a mixture of said fibers (a) and fibers having a water content of about 8 to about 15% and a fiber diameter of 5 to about 30μ.
Claim 3
Dependent Claim
20 words
The oil-water separation filter of claim 1, wherein said porous material further contains a fluorocarbon powder or a polyimide powder.
Claim 4
Dependent Claim
53 words
The oil-water separation filter of claim 2, wherein said fluorocarbon powder is a tetrafluoroethylene powder having an apparent specific gravity of 300 to 500 grams per liter, a specific gravity of about 2.25 to about 2.3, and more than 50% of the particles of said powder have a particle size of 5 microns.
Claim 5
Dependent Claim
36 words
The oil-water separation filter of claim 1, wherein said porous material further contains an inorganic material selected from the group consisting of sintered clay, alumina, activated carbon, diatomaceous earth, calcium carbonate, magnesium carbonate and magnesium hydroxide.
Claim 6
Dependent Claim
20 words
The oil-water separation filter of claim 1, wherein said porous material further contains sodium chloride, sodium bicarbonate or antimony bicarbonate.
Claim 7
Dependent Claim
48 words
The oil-water separation filter of claim 1 wherein said polyethylene in said sintered polyethylene has a viscosity average molecular weight of 700,000 to 4,000,000, a density of 0.94 to 0.97 g/cc, a melt index of 0.01 dg/min. or less and a melting point of 130° to 138° C.
Claim 8
Dependent Claim
116 words
A process for separating oil from water containing oil, which comprises flowing the water containing oil through an oil-water separation filter comprising (1) a porous material comprising a sintered polyethylene powder bonded to (2) a fibrous layer having a thickness of about 0.5 to about 5 mm and a porosity of about 70 to about 90% comprising fibers having a water content of about 0.4 to about 5%, a critical surface tension of about 25 to about 45 dyne/cm and a fiber diameter of about 5 to about 30μ or a mixture of said fibers and fibers having a water content of about 8 to about 15% and a fiber diameter of 5 to about 30μ.
Claim 9
Dependent Claim
116 words
A process for separating oil from water containing oil, which comprises flowing the water containing oil through an oil-water separation filter comprising (1) a porous material comprising a sintered polyethylene powder bonded to (2) a fibrous layer having a thickness of about 0.5 to about 5 mm and a porosity of about 70 to about 90% comprising fibers having a water content of about 0.4 to about 5%, a critical surface tension of about 25 to about 45 dyne/cm and a fiber diameter of about 5 to about 30μ or a mixture of said fibers and fibers having a water content of about 8 to about 15% and a fiber diameter of 5 to about 30μ.
Claim 10
Dependent Claim
19 words
The separation process of claim 7, wherein said porous material further contains a tetrafluoroethylene powder or a polyimide powder.
Claim 11
Dependent Claim
47 words
The separation process of claim 8, wherein said tetrafluoroethylene powder has an apparent specific gravity of 300 to 500 grams per liter, a specific gravity of 2.25 to about 2.3, and more than 50% of the particles of said powder have a particle size of 5 microns.
Claim 12
Dependent Claim
35 words
The separation process of claim 7, wherein said porous material further contains an inorganic material selected from the group consisting of sintered clay, alumina, activated carbon, diatomaceous earth, calcium carbonate, magnesium carbonate and magnesium hydroxide.
Claim 13
Dependent Claim
19 words
The separation process of claim 7, wherein said porous material further contains sodium chloride, sodium bicarbonate or antimony bicarbonate.
Claim 14
Dependent Claim
26 words
The separation process of claim 7, wherein said fibrous layer comprises a filter paper impregnated with an epoxy resin, a polyester resin or an acrylate resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |