US2679471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for refining hydrocarbon liquids
Assignee: Pure Oil Co
•
Filing: 1951-08-11
•
Granted: 1954-05-25
•
Expires: 1971-08-11
Abstract
No abstract record available.
Inventors
- 👤 George W Ayers
- 👤 Walter J Sandner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:21
CPC Classifications
C; C10; C10G; C10G25/00; C10G71/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE METHOD OF PREPARING MINERAL OIL LUBRICATING OIL HAVING SUBSTANTIALLY A ZERO ACID NUMBER COMPRISING CONTACTING AN ORGANIC ACID-CONTAINING PETROLEUM LUBRICATING OIL STOCK WITH A SOLID ADSORPTIVE AGENT OTHER THAN ZICONIA AND SELECTED FROM THE GROUP CONSISTING OF SILICA GEL, CLAYS, ZEOLITES, AND METAL OXIDE GELS AT ELEVATED TEMPERATURE IN SUFFICIENT QUANTITY TO SUBSTANTIALLY REDUCE THE ACID NUMBER OF THE OIL BUT INSUFFICIENT TO REDUCE THE ACID NUMBER TO ZERO AND THEN CONTACTING THE OIL STOCK WITH A NON-GEL, DRIED, PRECIPITATED ZIRCONIA, SUBSTANTIALLY FREE OF
Claim 2
Independent Claim
85 words
THE METHOD OF PREPARING MINERAL OIL LUBRICATING OIL HAVING SUBSTANTIALLY A ZERO ACID NUMBER COMPRISING CONTACTING AN ORGANIC ACID-CONTAINING PETROLEUM LUBRICATING OIL STOCK WITH A SOLID ADSORPTIVE AGENT OTHER THAN ZICONIA AND SELECTED FROM THE GROUP CONSISTING OF SILICA GEL, CLAYS, ZEOLITES, AND METAL OXIDE GELS AT ELEVATED TEMPERATURE IN SUFFICIENT QUANTITY TO SUBSTANTIALLY REDUCE THE ACID NUMBER OF THE OIL BUT INSUFFICIENT TO REDUCE THE ACID NUMBER TO ZERO AND THEN CONTACTING THE OIL STOCK WITH A NON-GEL, DRIED, PRECIPITATED ZIRCONIA, SUBSTANTIALLY FREE OF
References Cited (Backward Citations)
US2057629A
Cited
US2234367A
Cited
US2375596A
Cited
US2340939A
Cited
US2487806A
Cited
US2574434A
Cited
US2618586A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |