US3781222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydration catalysts,particularly for the dehydration of diols
Assignee: Compagnie Francaise de Raffinage SA
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Filing: 1971-04-09
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Granted: 1973-12-25
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Expires: 1991-04-09
Abstract
Abstract CATALYSTS AND METHODS OF PREPARING THE SAME FOR THE DEHYDRATION OF DIOLS, E.G. 2-METHYL-2,3-BUTANEDIOL TO ISOPRENE, CONSTITUTED AT LEAST IN PART OF A PYROPHOSPHATE OF AT LEAST ONE METAL BELONGING TO THE GROUP CONSISTING OF LITHIUM, SODIUM, STRONTIUM, AND BARIUM.
Inventors
- 👤 J Weisang
- 👤 G Szabo
- 👤 J Maurin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:13
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/60; B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/1802; B01J27/1806; C07C1/00; C07C1/20; C07C1/24; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
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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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |