Patent US3657376A successfully refreshed from Google Patents.
US3657376A
Expired / Lapsed
US
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Production of isoprene
Assignee: BASF SE
•
Filing: 1970-06-03
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Granted: 1972-04-18
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Expires: 1990-06-03
Abstract
Abstract PROCESS FOR THE MANUFACTURE OF ISOPRENE BY CANALYTIC DEHYDRATION OF 3-METHYL-3-BUTEN-1-OL IN THE PRESENCE OF CALCIUM PHOSPHATE AS CATALYST AT ELEVATED TEMPERATURES, WHEREIN DEHYDRATION IS CARRIED OUT, PREFERABLY IN THE PRESENCE OF STREAM, AT TEMPERATURES BETWEEN 200* AND 300*C. USING A 3-METHYL-3-BUTEN-1-OL HAVING A PURITY OF A LEAST 85% BY WEIGHT BASED ON THE TOTAL WEIGHT OF OXYGEN-CONTAINING ORGANIC COMPOUNDS PRESENT IN THE STARTING MATERIAL. ISOPRENE IS AN IMPORTANT MONOMER, FOR EXAMPLE IN THE PRODUCTION OF SYNTHETIC RUBBER.
Inventors
- 👤 Adolf Stuebinger
- 👤 Herbert Mueller
- 👤 Hermann Overwien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:55
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20; C07C1/24; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167
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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |