Patent US3408335A successfully refreshed from Google Patents.
US3408335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anionic polymerization of lactams with unsaturated lactone as promoter
Assignee: Stamicarbon BV
•
Filing: 1965-06-10
•
Granted: 1968-10-29
•
Expires: 1985-06-10
Abstract
No abstract record available.
Inventors
- 👤 Johannes Van Mourik
- 👤 Johannes Van Beveren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:10
CPC Classifications
C; C07; C07D; C07D409/00; C07D409/02; C07D409/04; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/18; C08G69/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2809958A
Cited
US3214415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |