Patent US3767571A successfully refreshed from Google Patents.
US3767571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil removal from waste waters
Assignee: ChampionX LLC
•
Filing: 1969-12-17
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Granted: 1973-10-23
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Expires: 1989-12-17
Abstract
Abstract A process for the removal of oil and oily organic contaminants from waste waters using magnetite (Fe3O4) is disclosed.
Inventors
- 👤 W Lorenc
- 👤 J Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:21
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/281; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D17/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
16 words
The process of claim 1 in which the removal of the magnetite particles is by filtration.
Claim 2
Dependent Claim
17 words
The process of claim 1 in which the removal of the magnetite particles is by magnetic means.
Claim 3
Dependent Claim
18 words
The process of claim 1 which includes the additional step of: regenerating the magnetite by removing the oil.
Claim 4
Dependent Claim
17 words
The process of claim 4 in which the removal of the oil is achieved by solvent extraction.
Claim 5
Dependent Claim
16 words
The process of claim 4 in which the removal of the oil is achieved by burning.
Claim 6
Dependent Claim
23 words
The process of claim 4 in which the regenerated magnetite is returned to the aqueous liquid for further adsorption of the oily waste.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |