US2951886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery and purification of benzene
Assignee: Ashland LLC
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Filing: 1958-04-15
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Granted: 1960-09-06
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Expires: 1978-04-15
Abstract
No abstract record available.
Inventors
- 👤 Thorwell H Paulsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:10
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/04; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/26; C10; C10G; C10G2400/00; C10G2400/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE PROCESS OF RECOVERING BENZENE OF AT LEAST NITRATION GRADE PURITY FROM AN IMPURE HYDROCARBON STOCK CONTAINING BENZENE AND ALKYL BENZENE COMPONENTS WHICH PROCESS COMPRISES SUBJECTING THE SAID STOCK, IN A SINGLE PASS, TO CATALYTIC CRACKING CONDITIONS IN THE PRESENCE OF HYDROGEN AND A CATALYST CONSISTING OF APPROXIMATELY 10 TO 15% BY WEIGHT OF CHROMIUM OXIDE ON A HIGH PURITY LOW SODIUM CONTENT GAMMA-TYPE ALUMINA SUPPORT, AT A TEMPERATURE BELOW APPROXIMATELY 1200*F. WHEREBY A HIGH YIELD OF BENZENE IS OBTAINED.
Claim 2
Dependent Claim
80 words
THE PROCESS OF RECOVERING BENZENE OF AT LEAST NITRATION GRADE PURITY FROM AN IMPURE HYDROCARBON STOCK CONTAINING BENZENE AND ALKYL BENZENE COMPONENTS WHICH PROCESS COMPRISES SUBJECTING THE SAID STOCK, IN A SINGLE PASS, TO CATALYTIC CRACKING CONDITIONS IN THE PRESENCE OF HYDROGEN AND A CATALYST CONSISTING OF APPROXIMATELY 10 TO 15% BY WEIGHT OF CHROMIUM OXIDE ON A HIGH PURITY LOW SODIUM CONTENT GAMMA-TYPE ALUMINA SUPPORT, AT A TEMPERATURE BELOW APPROXIMATELY 1200*F. WHEREBY A HIGH YIELD OF BENZENE IS OBTAINED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |