US3816567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing butadiene polymer
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1971-12-27
•
Granted: 1974-06-11
•
Expires: 1991-12-27
Abstract
Abstract A PROCESS FOR PRODUCING BUTADIENE POLYMER WHICH COMPRISES POLYMERIZING 1,3-BUTADIENE IN THE PRESENCE OF NOVEL CATALYST SYSTEMS. THE PRODUCED BUTADIENE POLYMER CONTAINS PREDOMINANTLY CIS-1,4 STRUCTURE.
Inventors
- 👤 Y Yagi
- 👤 H Sato
- 👤 S Narisawa
- 👤 M Hino
- 👤 K Hata
- 👤 S Yasui
- 👤 A Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:18
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/06; C08F2410/00; C08F2410/01
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |