US3644585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polybutadiene
Assignee: Ube Corp
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Filing: 1968-12-13
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Granted: 1972-02-22
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Expires: 1988-12-13
Abstract
Abstract PROCESS FOR THE PREPARATION OF POLYBUTADIENE BY POLYMERIZING 1,3-BUTADIENE IN THE PRESENCE OF A CIS-1,4-POLYMERIZATION CATALYST, CHARACTERIZED IN THAT TRANS-1,4-POLYBUTADIENE IS ADDED TO THE POLYMERIZATION SYSTEM IN ADVANCE OF THE POLYMERIZATION RACTION, AND THE POLYMERIZATION OF 1,3-BUTADIENE IS PERFORMED IN THE PRESENCE OF SO ADDED TRANS-1,4-POLYBUTADIENE.
Inventors
- 👤 Motowo Takayanagi
- 👤 Shotaro Sugiura
- 👤 Tesuro Matsuura
- 👤 Haruo Ueno
- 👤 Keiichi Tsuji
- 👤 Shinzi Yamamoto
- 👤 Fuminori Matumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:49
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F136/00; C08F136/02; C08F136/04; C08F136/06
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |