US3629212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactivation of ziegler-type catalysts
Assignee: Huels AG
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Filing: 1969-08-26
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Granted: 1971-12-21
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Expires: 1989-08-26
Abstract
Abstract ZIEGLER CATALYSTS ARE REACTIVATED AFTER THE CATALYSTS ARE EITHER PARTIALLY OR PREFERABLY COMPLETELY INACTIVE BY THE ADDITION OF A VARIETY OF REACTIVATORS, NOTABLY SULFUR COMPOUNDS, SUCH AS THIONYL CHLORIDE. THE PREFERRED PROCESS COMPRISES AT LEAST THREE SERIALLY CONNECTED REACTORS WHEREIN THE REACTIVATORS ARE CONTINUOUSLY ADDED TO ALL BUT THE FIRST REACTOR.
Inventors
- 👤 Kurt Benedikter
- 👤 Karl Otto Hagel
- 👤 Klaus Kiepert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:34
CPC Classifications
C; C08; C08F; C08F210/00
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |