Patent US3529054A successfully refreshed from Google Patents.
Patent US2709193A successfully refreshed from Google Patents.
US2709193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dealkylation of aromatic hydrocarbons
Assignee: Imperial Chemical Industries Ltd
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Filing: 1951-06-29
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Granted: 1955-05-24
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Expires: 1971-06-29
Abstract
No abstract record available.
Inventors
- 👤 Clough Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:49
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C2521/00; C07C2521/12; C07C2527/00; C07C2527/06; C07C2527/128
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR THE DEALKYLATION OF MONOCYCLIC AROMATIC HYDROCARBONS CONTAINING AT LEAST ONE SUBSTITUENT ALKYL GROUP WHICH COMPRISES THE STEP OF TREATING WITH HYDROGEN A MONOCYCLIC AROMATIC HYDROCARBON CONTAINING AT LEAST ONE SUBSTITUENT ALKYL GROUP AT A TEMPERATURE ABOVE 500* C. AND A PRESSURE HIGHER THAN 100 ATMOSPHERES GUAGE IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF ALUMINUM SILICATE AND FERRIC FLUORIDE.
Claim 2
Dependent Claim
63 words
A PROCESS FOR THE DEALKYLATION OF MONOCYCLIC AROMATIC HYDROCARBONS CONTAINING AT LEAST ONE SUBSTITUENT ALKYL GROUP WHICH COMPRISES THE STEP OF TREATING WITH HYDROGEN A MONOCYCLIC AROMATIC HYDROCARBON CONTAINING AT LEAST ONE SUBSTITUENT ALKYL GROUP AT A TEMPERATURE ABOVE 500* C. AND A PRESSURE HIGHER THAN 100 ATMOSPHERES GUAGE IN THE PRESENCE OF A CATALYST CONSISTING ESSENTIALLY OF ALUMINUM SILICATE AND FERRIC FLUORIDE.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |