US3754050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of purifyng conjugated diolefines
Assignee: Stamicarbon BV
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Filing: 1971-02-24
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Granted: 1973-08-21
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Expires: 1991-02-24
Abstract
Abstract ALLENES, ACETYLENE AND VINYL CYCLOHEXENES ARE REMOVED FROM CONJUATED DIOLEFINS BY ADSORPTION WITH A MIXTURE OF COPPER OXIDE AND ZINC OXIDE AT A TEMPERATURE BETWEEN 25*C. AND 175*C. .
Inventors
- 👤 C Duyverman
- 👤 J Miessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:44
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |