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Patent US4493772A successfully refreshed from Google Patents.
US4493772A
Expired / Lapsed
US
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Filter for removing water from water-containing oil and method for the same
Assignee: Japan Exlan Co Ltd
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Filing: 1981-12-28
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Granted: 1985-01-15
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Expires: 2001-12-28
Abstract
Abstract A filter capable of separating and removing water semi-permanently from oil by effectively transforming water which is finely, stably dispersed in oil into coarse drops, which filter is composed of a fiber assembly formed with a particular binder, and a method for separating and removing water by passing the oil to be treated through said filter.
Inventors
- 👤 Koji Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:54
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/163; B01D17/00; B01D17/02; B01D17/04; B01D17/045; Y; Y10; Y10S; Y10S210/00; Y10S210/05
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
A water-removing filter for removing water from a water-containing oil, which comprises an assembly of fibers formed from a polymer having a SP value (solubility parameter) of at least 10.0 and, as a binder for impregnating and forming the fiber assembly, a polymeric aqueous emulsion having a surface tension of at least 50 dynes/cm, wherein the density of the filter is from 0.05 to 0.9 g/cm 3 .
Claim 2
Dependent Claim
68 words
A water-removing filter for removing water from a water-containing oil, which comprises an assembly of fibers formed from a polymer having a SP value (solubility parameter) of at least 10.0 and, as a binder for impregnating and forming the fiber assembly, a polymeric aqueous emulsion having a surface tension of at least 50 dynes/cm, wherein the density of the filter is from 0.05 to 0.9 g/cm 3 .
Claim 3
Dependent Claim
20 words
The water-removing filter as claimed in claim 1 wherein the fibers have a length of from 0.5 to 100 mm.
Claim 4
Dependent Claim
14 words
The water-removing filter as claimed in claim 1 wherein the fibers are acrylic fibers.
Claim 5
Dependent Claim
44 words
The water-removing filter as claimed in claim 1 wherein the polymeric aqueous emulsion is prepared by polymerizing a monomer having an unsaturated radical-polymerizable bond, in the presence of an aqueous polymer containing at least one functional group, in an aqueous medium below pH 4.
Claim 6
Independent Claim
75 words
A method of separating and removing water from water-containing oil, which comprises passing the oil through a filter comprising an assembly of fibers formed from a polymer having a SP value (solubility parameter) of at least 10.0 and, as a binder for impregnating and forming the fiber assembly, a polymeric aqueous emulsion having a surface tension of at least 50 dynes/cm, wherein the density of the filter is from 0.05 to 0.9 g/cm 3 .
Claim 7
Independent Claim
75 words
A method of separating and removing water from water-containing oil, which comprises passing the oil through a filter comprising an assembly of fibers formed from a polymer having a SP value (solubility parameter) of at least 10.0 and, as a binder for impregnating and forming the fiber assembly, a polymeric aqueous emulsion having a surface tension of at least 50 dynes/cm, wherein the density of the filter is from 0.05 to 0.9 g/cm 3 .
Claim 8
Dependent Claim
30 words
The method of removing water as claimed in claim 1 wherein the water passed through the filter is thereby transformed into coarse drops having an average diameter above 1 mm.
Claim 9
Dependent Claim
22 words
The method of removing water as claimed in claim 5 wherein the fibers have a length of from 0.5 to 100 mm.
Claim 10
Dependent Claim
16 words
The method of removing water as claimed in claim 5 wherein the fibers are acrylic fibers.
Claim 11
Dependent Claim
60 words
The method of removing water as claimed in claim 5 wherein, after the oil is passed through said filter, the oil is further passed through a second filter formed of a fiber assembly comprising a single element product of water-swellable fibers having a degree of water-swellability of 1-50 cc/g, or a compounded product of said water-swellable fibers and other fibers.
Claim 12
Dependent Claim
29 words
The method of removing water as claimed in claim 9 wherein, in the second filter, the fiber assembly has a density of not more than 0.1 g/cm 3 .
Claim 13
Dependent Claim
46 words
The method of removing water as claimed in claim 5 wherein the polymeric aqueous emulsion is prepared by polymerizing a monomer having an unsaturated radical-polymerizable bond, in the presence of an aqueous polymer containing at least one functional group, in an aqueous medium below pH 4.
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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |