Patent US3279791A successfully refreshed from Google Patents.
US3734776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning oil laden metal waste to recover the metal and reclaim the oil
Assignee: FMC Corp
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Filing: 1971-08-04
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Granted: 1973-05-22
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Expires: 1991-08-04
Abstract
Abstract Oil laden metal waste such as turnings, chips and the like are cleaned to remove oil and other impurities from the metal waste enabling recovery of the metal and reclaiming of the oil. The cleaning is achieved through counterflow of a detergent solution in a wash bath, removing the cleaned metal waste from the bath and separating a substantial quantity of the remaining moisture therefrom, and removing the detergent solution from the wash bath and running it through a rehabilitation circuit where it is subjected to centrifugal force to separate sludge and oil from the solution. Then concentrated make up detergent solution is added, the make up and restored detergent solution heated and returned from the rehabilitation circuit to the wash bath.
Inventors
- 👤 J Keogh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:49
CPC Classifications
C; C23; C23G; C23G1/00; B; B08; B08B; B08B3/00; B08B3/04; B08B3/041; B08B3/042; B23; B23Q; B23Q11/00; B23Q11/0042; B23Q11/0057; C11; C11B; C11B13/00; Y; Y02; Y02P; Y02P70/00; Y02P70/10; Y02W; Y02W30/00; Y02W30/50; Y02W30/74
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
54 words
A process for cleaning oil laden metal waste as recited in claim 1 wherein the substantial quantity of remaining moisture is separated from the removed cleaned metal waste by subjecting the cleaned metal waste to centrifugal force, and the separated remaining moisture is returned to said rehabilitation circuit for reuse in the wash bath.
Claim 2
Dependent Claim
37 words
A process for cleaning oil laden metal waste as recited in claim 1 wherein the substantial quantity of remaining moisture is separated from the removed cleaned metal waste by subjecting the cleaned metal waste to drying conditions.
Claim 3
Dependent Claim
55 words
A process for cleaning oil laden metal waste as recited in claim 1 wherein the removed detergent solution is subjected in said rehabilitation circuit to centrifugal force to separate said sludge from the detergent solution and oil, and the detergent solution and oil subjected to centrifugal force to separate the oil from the detergent solution.
Claim 4
Dependent Claim
37 words
A process for cleaning oil laden metal waste as recited in claim 1 wherein said metal waste is propelled upwardly along an incline to move from total immersion in said wash bath out of said wash bath.
Claim 5
Dependent Claim
70 words
A process for cleaning oil laden metal waste as recited in claim 5 wherein said provided flow of detergent solution to form a wash bath has a plurality of portions through which said metal waste is propelled with adjacent of said portions being separated by an intermediate portion through which said metal waste is propelled, said metal waste being out of said detergent solution when propelled through said intermediate portion.
Claim 6
Dependent Claim
35 words
A process for cleaning oil laden metal waste as recited in claim 1 wherein the detergent solution removed from the wash bath is screened to remove coarse particles prior to being subjected to centrifugal force.
Claim 7
Dependent Claim
33 words
A process for cleaning oil laden metal waste as recited in claim 1 wherein said wash bath is heated to maintain the desired cleaning temperature during agitated counterflow of the waste and solution.
Claim 8
Dependent Claim
59 words
A process for cleaning oil laden metal waste as recited in claim 1 wherein the detergent solution removed from the wash bath is accumulated in the rehabilitation circuit in a surge tank; and portions withdrawn from said accumulation and subjected to centrifugal force to separate said sludge therefrom prior to centrifugal separation of said oil from said detergent solution.
Claim 9
Dependent Claim
40 words
A process for cleaning oil laden metal waste as recited in claim 9 wherein the detergent solution and oil are thereafter accumulated in a settling basin; and excess liquid accumulating in said settling basin overflows back to said surge tank.
Claim 10
Dependent Claim
33 words
A process for cleaning oil laden metal waste as recited in claim 9 wherein the accumulation of detergent solution in said surge tank is subjected to agitation to maintain the sludge in suspension.
References Cited (Backward Citations)
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Cited
US1743466A
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US2714574A
Cited
GB808901A
Cited
US2965522A
Cited
GB967010A
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US3163929A
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |