Patent US3291718A successfully refreshed from Google Patents.
US3291718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination lube process
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1965-03-16
•
Granted: 1966-12-13
•
Expires: 1985-03-16
Abstract
No abstract record available.
Inventors
- 👤 Frank A Biribauer
- 👤 James D Bushnell
- 👤 Harold N Weinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:16
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/02; C10G21/04; C10G2400/00; C10G2400/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN A PROCESS FOR THE PRODUCTION OF NAPHTHENIC AND PARAFFINIC LUBRICATING OILS FROM A PARAFFINIC ATMOSPHERIC RESIDUUM WHICH COMPRISES INTRODUCING THE SAID ATMOSPHERIC RESIDUUM INTO A COMBINATION TREATING ZONE,INTRODUCING A SOLVENT HAVING A PREFERENTIAL SELECTIVITY FOR AROMATIC-TYPE CONSTITUENTS AS COMPARED TO PARAFFINIC-TYPE CONSTITUENTS INTO THE UPPER AREA OF SAID COMBINATION ZONE, INTRODUCING A DESPHALTING SOLVENT INTO THE LOWER AREA OF SAID COMBINATION ZONE,REMOVING A DESPHALTED RAFFINATE PHASE FROM THE TOP REGION OF THE SAID COMBINATION ZONE,PASSING SAID RAFFINATE TO A HEART-CUT TOWER ZONE,IN-
Claim 2
Dependent Claim
83 words
IN A PROCESS FOR THE PRODUCTION OF NAPHTHENIC AND PARAFFINIC LUBRICATING OILS FROM A PARAFFINIC ATMOSPHERIC RESIDUUM WHICH COMPRISES INTRODUCING THE SAID ATMOSPHERIC RESIDUUM INTO A COMBINATION TREATING ZONE,INTRODUCING A SOLVENT HAVING A PREFERENTIAL SELECTIVITY FOR AROMATIC-TYPE CONSTITUENTS AS COMPARED TO PARAFFINIC-TYPE CONSTITUENTS INTO THE UPPER AREA OF SAID COMBINATION ZONE, INTRODUCING A DESPHALTING SOLVENT INTO THE LOWER AREA OF SAID COMBINATION ZONE,REMOVING A DESPHALTED RAFFINATE PHASE FROM THE TOP REGION OF THE SAID COMBINATION ZONE,PASSING SAID RAFFINATE TO A HEART-CUT TOWER ZONE,IN-
References Cited (Backward Citations)
US2095972A
Cited
US2168875A
Cited
US2692222A
Cited
US2687982A
Cited
US2764529A
Cited
US3052622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-12 | 1970-06-13 | 1970-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-12 | 1974-06-13 | 1974-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-12 | 1978-06-13 | 1978-12-13 | $7700.00 | Window Closed / Lapsed |