US3904512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reclaiming used crankcase oil
Assignee: BC Research (Canada)
•
Filing: 1973-12-26
•
Granted: 1975-09-09
•
Expires: 1993-12-26
Abstract
Abstract A method of reclaiming used crankcase oil wherein anhydrous zinc chloride is added to the oil, the mixture is heated and stirred under vacuum, and after the sludges generated are removed, the separated oil is further treated with clay and filtration to effect color removal.
Inventors
- 👤 Trevor P Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:37
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
102 words
A PROCESS FOR RECLAIMING USED CRANKCASE OIL COMPRISING THE STEPS OF MIXING AND STERRING SAID CRANKCASE OIL WITH ABOUT 3 TO ABOUT 10%W OF ANHYDROUS ZINC CHLORIDE, RAPIDLY HEATING THE MIXTURR UNDER VACUUM TO A TEMPERATURE OF 150* TO 290*C FOR A TIME SUFFICIENT TO FREE CONTAMINANTS FROM THE OIL AS VAPOR AND SLUDGE, SEPARATING THE SUPERNATENT OIL FROM SAID SLUDGE, MIXING ACTIVATED CLAY WITH THE SEPARATED OIL, STIRRING AND RAPIDLY HEATING THE OIL-CLAY MIXTURE UNDER VACUUM TO A TEMPERATURE AND FOR A TIME SUFFICIENT TO PROVIDE A DESIRED COLOR IN THE FINISHED OIL, AND SEPARATING SAID OIL FROM THE CLAY SLUDGE.
Claim 2
Dependent Claim
35 words
A process as claimed in claim 1 in which the used oil is heated to a temperature of from about 175* to about 290*C and maintained at said temperature for about 20 to 30 minutes.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 in which the amount of clay added to the separated oil is from about 5 to about 15%w.
Claim 4
Dependent Claim
36 words
A process as claimed in claim 3 in which the oil-clay mixture is heated to a temperature of from about 120* to about 235*C, and maintained at said temperature for about 20 to about 60 minutes.
Claim 5
Dependent Claim
34 words
A process as claimed in claim 1 in which the separation of the supernatent oil from the sludge is accomplished by cooling and settling the mixture and then decanting the oil from the sludge.
Claim 6
Dependent Claim
26 words
A process as claimed in claim 1 in which the separation of the supernatent oil from the sludge is accomplished by means of a suitable filter.
Claim 7
Dependent Claim
125 words
A process for reclaiming used crankcase oil comprising the steps of mixing and stirring said crankcase oil with about 3 to about 10%w of anhydrous zinc chloride, rapidly heating the mixture under absolute pressure of about 30 to about 500 mm Hg to a temperature of about 175* to 290*C for about 20 to about 30 minutes to free contaminants from the oil as vapor and sludge, separating the supernatent oil from said sludge, mixing for about 5 to about 15%w activated clay with the separated oil, stirring and rapidly heating the oil-clay mixture under about 30 to about 500 mm Hg to a temperature of about 120* to 235*C for about 20 to about 60 minutes, and separating the oil from the clay sludge.
References Cited (Backward Citations)
US299324A
Cited
US1769794A
Cited
US1842983A
Cited
US2106010A
Cited
US2316954A
Cited
US3417012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |