US3960719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coalescence filter for oil-water dispersions
Assignee: Phillips Petroleum Co
•
Filing: 1973-12-06
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Granted: 1976-06-01
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Expires: 1993-12-06
Abstract
Abstract A filtering medium composed of a fabric made from an oleophilic fiber-forming polymer and having a high ratio of surface area to unit weight is used in coalescing oil dispersed in water thereby facilitating separation of oil droplets dispersed in water. In one embodiment a capcoated, nonwoven polypropylene fabric provides an excellent coalescing medium.
Inventors
- 👤 Clarence R. Bresson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:00
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/045; Y; Y10; Y10S; Y10S210/00; Y10S210/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A method for agglomerating oil dispersed in water, said method comprising passing a mixture of oil dispersed in water through a coalescing filter, said filter comprising from about three to about 25 strata of about 30 to about 100 mils in thickness for a total thickness of at least 0.5 inch of polypropylene fibers needled to produce a coherent fabric fused on one side only and capcoated with an additional layer of polypropylene fibers needle punched into the unfused side.
Claim 2
Independent Claim
80 words
A method for agglomerating oil dispersed in water, said method comprising passing a mixture of oil dispersed in water through a coalescing filter, said filter comprising from about three to about 25 strata of about 30 to about 100 mils in thickness for a total thickness of at least 0.5 inch of polypropylene fibers needled to produce a coherent fabric fused on one side only and capcoated with an additional layer of polypropylene fibers needle punched into the unfused side.
Claim 3
Dependent Claim
24 words
A method of claim 1 wherein said fabric has a ratio of surface area to unit weight of at least 1200 cm 2 /g.
Claim 4
Dependent Claim
46 words
A method of claim 2 wherein said fabric has a ratio of surface area to unit weight in the range of about 1500 to about 2100 cm 2 /g and is of a total filter thickness in the range of about 0.5 to about 2 inches.
Claim 5
Dependent Claim
58 words
A method for removing oil from a mixture comprising dispersed oil in water said method comprising: a. agglomerating at least a portion of said dispersed oil by the method of claim 1, b. allowing coalesced oil droplets to collect as a phase separate from the filtered water, and c. removing the water and the oil as separate streams.
Claim 6
Dependent Claim
77 words
A coalescing filter comprising from about three to about 25 strata of about 30 to about 100 mils in thickness for a total thickness of at least 0.5 inch of polypropylene fiber needled to produce a coherent fabric having a ratio of surface area to unit weight of at least 1200 cm 2 /g and each stratum fused on one side only and capcoated with an additional layer of polypropylene fibers needle punched into the unfused side.
Claim 7
Dependent Claim
77 words
A coalescing filter comprising from about three to about 25 strata of about 30 to about 100 mils in thickness for a total thickness of at least 0.5 inch of polypropylene fiber needled to produce a coherent fabric having a ratio of surface area to unit weight of at least 1200 cm 2 /g and each stratum fused on one side only and capcoated with an additional layer of polypropylene fibers needle punched into the unfused side.
Claim 8
Dependent Claim
44 words
A filter of claim 5 wherein said fabric has a ratio of surface area to unit weight in the range of about 1500 to about 2100 cm 2 /g and a total filter thickness in the range of about 0.5 to about 2 inches.
References Cited (Backward Citations)
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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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |