US2754337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cycloheptatrienes
Assignee: Shell Development Co
•
Filing: 1953-01-06
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Granted: 1956-07-10
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Expires: 1973-01-06
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Chirtel
- 👤 Walter M Halper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:43
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/31; C07C17/00; C07C17/26; C07C17/30; C07C17/35; C07C17/358
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
THE ISOMERIZATION OF BICYCLO-(2.2.1)-2,5-HEPTADIENE TO 1,3,5-CYCLOHEPTATRIENE BY PASSING IT THROUGH A REACTION ZONE IN WHICH IT IS HEATED AT A TEMPERATURE OF ABOUT 425475* C. UNDER SUBSTANTIALLY ATMOSPHERIC PRESSURE FOR A TIME OF ABOUT 1-10 SECONDS.
Claim 2
Dependent Claim
36 words
THE ISOMERIZATION OF BICYCLO-(2.2.1)-2,5-HEPTADIENE TO 1,3,5-CYCLOHEPTATRIENE BY PASSING IT THROUGH A REACTION ZONE IN WHICH IT IS HEATED AT A TEMPERATURE OF ABOUT 425475* C. UNDER SUBSTANTIALLY ATMOSPHERIC PRESSURE FOR A TIME OF ABOUT 1-10 SECONDS.
References Cited (Backward Citations)
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US2481160A
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US2629750A
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US2537638A
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US2626921A
Cited
US7647081B2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-10 | 1960-01-09 | 1960-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-10 | 1964-01-09 | 1964-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-10 | 1968-01-09 | 1968-07-10 | $7700.00 | Window Closed / Lapsed |