US3489737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline isotactic copolymers of styrene derivatives prepared with ionic coordination catalysts
Assignee: Montedison SpA
•
Filing: 1965-09-27
•
Granted: 1970-01-13
•
Expires: 1985-09-27
Abstract
No abstract record available.
Inventors
- 👤 Giulio Natta
- 👤 Dario Sianesi
- 👤 Paolo Corradini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:35
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/14; C08F212/16; C08F212/18; C08F212/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |