Patent US3143536A successfully refreshed from Google Patents.
US3143536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Depolymerization of styrene in the presence of free radical generating substances
Assignee: Montedison SpA
•
Filing: 1958-01-29
•
Granted: 1964-08-04
•
Expires: 1978-01-29
Abstract
No abstract record available.
Inventors
- 👤 Guzzetta Giuseppe
- 👤 Sabbioni Franco
- 👤 Gechele Giovanni Battista
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:43
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50; C08F2810/00; C08F2810/10; Y; Y10; Y10S; Y10S260/00; Y10S260/43
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2430993A
Cited
US2882263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |