Patent US3753967A successfully refreshed from Google Patents.
US3753967A
Expired / Lapsed
US
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Process of preparing polymers of conjugated dienes
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 AN IMPROVED PROCESS FOR POLYMERIZING CONJUGATED DIENES IN THE PRESENCE OF A CATALYST COMPRISING ADDING A METAL CONTAINING LEWIS ACID TO THE REACTION MIXTURE TO CONTROL THE MOLECULAR WEIGHT OF THE POLYMER BEINGG PRODUCED.
Inventors
- 👤 R Graff
- 👤 A Marchal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:29
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
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 |