US3467639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic compositions for polymerization and copolymerization of alpha-mono-olefins,and processes using such compositions
Assignee: SnamProgetti SpA
•
Filing: 1965-10-14
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Granted: 1969-09-16
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Expires: 1985-10-14
Abstract
No abstract record available.
Inventors
- 👤 Walter Marconi
- 👤 Sebastiano Cesca
- 👤 San Donato Milanese
- 👤 Sergio Arrighetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:34
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/10; C08F; C08F10/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3163611A
Cited
US3255169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-15 | 1973-03-17 | 1973-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-15 | 1977-03-17 | 1977-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-15 | 1981-03-17 | 1981-09-16 | $7700.00 | Window Closed / Lapsed |