Patent US3305478A successfully refreshed from Google Patents.
US3305478A
Expired / Lapsed
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Process for re-refining used lubricating oils
Assignee: Dow Chemical Co
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Filing: 1964-08-13
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Granted: 1967-02-21
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Expires: 1984-08-13
Abstract
No abstract record available.
Inventors
- 👤 James R Gilson
- 👤 Charles R Massicotte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:06
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016; C10G; C10G25/00; C10G25/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROCESS FOR REMOVATING A USED LUBRICATING OIL WHICH COMPRISES TREATING THE OIL AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 50*F. UP TO 400*F., WITH DIETHYLENETRIAMINE IN AN AMOUNT FROM ABOUT 0.1 PERCENT UP TO ABOUT 12 PERCENT, BASED ON THE WEIGHT OF THE OIL, SUFFICIENT TO FLOCCULATE CONTAMINATION IN THE USED OIL AND SEPARATING THE FLOCCULATED COMTAMINATION FROM THE OIL.
Claim 2
Dependent Claim
62 words
A PROCESS FOR REMOVATING A USED LUBRICATING OIL WHICH COMPRISES TREATING THE OIL AT A TEMPERATURE WITHIN THE RANGE FROM ABOUT 50*F. UP TO 400*F., WITH DIETHYLENETRIAMINE IN AN AMOUNT FROM ABOUT 0.1 PERCENT UP TO ABOUT 12 PERCENT, BASED ON THE WEIGHT OF THE OIL, SUFFICIENT TO FLOCCULATE CONTAMINATION IN THE USED OIL AND SEPARATING THE FLOCCULATED COMTAMINATION FROM THE OIL.
References Cited (Backward Citations)
US2238201A
Cited
US2822320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |