US3784538A
Expired / Lapsed
US
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Controlling a high-pressure reactor
Assignee: BASF SE
•
Filing: 1971-09-20
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Granted: 1974-01-08
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Expires: 1991-09-20
Abstract
Abstract A PROCESS FOR POLYMERIZING OLEFINS AT HIGH PRESSURE IN TUBULLAR REACTORS IN WHICH THE PRESSURE IS LOWERED AT INTERVALS FOR SHORT PRIODS, THE WHOLE OF THE TUBULAR REACTION ZONE BEING SUBDIVIDED ONE OR MORE TIME AND THE DECREASES IN PRESSURE BEING CARRIED OUT IN ONLY ONE SUBDIVISION, AND A NUMBER OF EXAMPLES OF CONSTRUCTION OF APPROPRIATE REACTION ZONES AND CONTROL EQUIPMENT OR CARRYING OUT THE PROCESS.
Inventors
- 👤 H Pfannmueller
- 👤 F Urban
- 👤 O Buechner
- 👤 W Sistig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:44
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/0006; C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/921
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |