US3498963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the catalytic preparation of 1,2-polybutadiene having a high percentage of vinyl configuration
Assignee: Mitsubishi Chemical Corp
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Filing: 1967-09-22
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Granted: 1970-03-03
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Expires: 1987-09-22
Abstract
No abstract record available.
Inventors
- 👤 Mitsuo Ichikawa
- 👤 Yasumasa Takeuchi
- 👤 Akira Kogure
- 👤 Hisami Kurita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:59
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |