US3773810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of 2,3-disubstituted 1,3-butadienes
Assignee: Novartis Corp
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Filing: 1971-07-28
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Granted: 1973-11-20
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Expires: 1991-07-28
Abstract
Abstract A NEW PROCESS FOR THE PREPARATION OF 2,3-DISUBSTITUTED 1,3-BUTADIENES, SUCH AS CN-,COCL-, COOALKYL-AND COOALLYL-DISUBSTITUTED 1,3-BUTADIENES IS DISCLOSED WHICH PROCESS COMPRISES HEATING CORRESPONDING GASEOUS CYCLOBUTENES TO A TEMPERTURE BETWEEN 90*C. AND 550*C., THE 2,3-DISUBSTITUTED 1,3-BUTADIENES OBTAINED THEREBY BEING USEFUL INTERMEDIATES FOR THE PREPARATION OF POLYMERS.
Inventors
- 👤 D Bellus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:30
CPC Classifications
C; C07; C07C; C07C255/00; C07C51/00; C07C51/347
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |