US3767716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of 1,3-cyclooctadiene
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1971-09-27
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Granted: 1973-10-23
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Expires: 1991-09-27
Abstract
Abstract A PROCESS FOR PRODUCTION OF 1,3-CYCLOOCTADIENE WHICH COMPRISES CONTACTING 1,5-CYCLOOCTADIENE WITH A CATALYST OBTAINED BY HEATING AN ALKALI METAL, AN ALKALI METAL HYDROXIDE AND ALUMINA AT A TEMPERATURE HIGHER THAN THE MELTING POINT OF THE ALKALI METAL. BY SUCH PROCESS, 1,3CYCLOOCTADIENE IN CIS-CIS FORM CAN BE PRODUCED PREDOMINANTLY IN AN EXCELLENT YIELD.
Inventors
- 👤 T Nagase
- 👤 G Suzukamo
- 👤 M Fukao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:19
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/02; B01J23/04; C; C07; C07C; C07C5/00; C07C5/22; C07C5/23; C07C5/25; C07C5/2506; C07C5/2556
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |