Patent US2868835A successfully refreshed from Google Patents.
US2868835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refining mineral oil materials
Assignee: Sunoco Inc
•
Filing: 1953-11-10
•
Granted: 1959-01-13
•
Expires: 1973-11-10
Abstract
No abstract record available.
Inventors
- 👤 James L Jezl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:20
CPC Classifications
C; C10; C10G; C10G29/00; C10G29/20; C10G17/00; C10G17/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
METHOD FOR REFINING PETROLEUM NAPHTHENIC ACIDS WHICH COMPRISES: CONTACTING SUCH NAPHTHENIC ACIDS WITH A PHTHALIC ACID ACYLATING AGENT AT A TEMPERATURE WITHIN THE APPROXIMATE RANGE FROM 200* F. TO 500* F.
Claim 2
Dependent Claim
31 words
METHOD FOR REFINING PETROLEUM NAPHTHENIC ACIDS WHICH COMPRISES: CONTACTING SUCH NAPHTHENIC ACIDS WITH A PHTHALIC ACID ACYLATING AGENT AT A TEMPERATURE WITHIN THE APPROXIMATE RANGE FROM 200* F. TO 500* F.
References Cited (Backward Citations)
US2072053A
Cited
GB190712606A
Cited
DE352917C
Cited
DE403134C
Cited
US1802336A
Cited
US2018715A
Cited
US2301528A
Cited
US2263176A
Cited
US2447190A
Cited
US2494133A
Cited
US2656380A
Cited
US2608520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-12 | 1962-07-14 | 1963-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-12 | 1966-07-14 | 1967-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-12 | 1970-07-14 | 1971-01-13 | $7700.00 | Window Closed / Lapsed |