Patent US3574329A successfully refreshed from Google Patents.
US3574329A
Expired / Lapsed
US
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Process for purifying water containing oil and solids
Assignee: DAVID K BEAVON
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Filing: 1969-09-29
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Granted: 1971-04-13
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Expires: 1989-09-29
Abstract
Abstract Water containing oil and particulate solids, typically oil-wet solids, is filtered through a filter media, such as a sand, to retain particulate solids thereby yielding clear water or a mixture of solids-free oil and water, which will readily separate by gravity. The filter media is periodically regenerated by steam stripping to remove retained oil, then backwashed to remove oilfree particulate solids.
Inventors
- 👤 David K Beavon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:18
CPC Classifications
B; B01; B01D; B01D12/00; B01D17/00; B01D17/02; B01D17/0208; B01D17/04; B01D17/045; B01D17/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
39 words
A process as claimed in claim 1 in which the oil-water system is fed to said filter media at a rate of from about 2 to about 10 gallons per minute per square foot of filter media surface area.
Claim 2
Dependent Claim
19 words
A process as claimed in claim 2 in whIch the oil-water system is fed downwardly through said filter media.
Claim 3
Dependent Claim
19 words
A process as claimed in claim 1 in which oil is periodically solvated from said filter media using steam.
Claim 4
Dependent Claim
24 words
A process as claimed in claim 1 in which oil is periodically solvated from said filter media using an organic solvent for said oil.
Claim 5
Dependent Claim
16 words
A process as claimed in claim 1 in which the filter media is backwashed with water.
Claim 6
Dependent Claim
35 words
A process as claimed in claim 6 in which the filter media is backwashed at a water-flow rate of from 3 to about 15 gallons per minute per square foot of filter media surface area.
Claim 7
Dependent Claim
14 words
A process as claimed in claim 1 in which backwashing is assisted by aeration.
Claim 8
Dependent Claim
29 words
A process as claimed in claim 1 in which the filter media comprises particles having an average particle size of from about 0.1 to about 5 mm. in diameter.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 1 in which the filter media is selected from the group consisting of sand, particulate coal and mixtures thereof.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |