US2739995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of conjugated dienes
Assignee: GAF Chemicals Corp
•
Filing: 1951-06-29
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Granted: 1956-03-27
•
Expires: 1971-06-29
Abstract
No abstract record available.
Inventors
- 👤 John W Copenhaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:38
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C2531/00; C07C2531/02; C07C2531/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A METHOD OF PRODUCING THE DIMER OF 2,2,4-TRIMETHYLHEPTADIENE-3,5 BY HEATING 2,2,4-TRIMETHYL-6-METHOXY HEPTENE-3 IN THE PRESENCE OF P-TOLUENE SULFONIC ACID.
Claim 2
Independent Claim
19 words
A METHOD OF PRODUCING THE DIMER OF 2,2,4-TRIMETHYLHEPTADIENE-3,5 BY HEATING 2,2,4-TRIMETHYL-6-METHOXY HEPTENE-3 IN THE PRESENCE OF P-TOLUENE SULFONIC ACID.
References Cited (Backward Citations)
DE268101C
Cited
US2184164A
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GB524849A
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CH211659A
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US2229652A
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US2369068A
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FR969925A
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US2561483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |