US2741652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of copolymers
Assignee: Celanese Corp
•
Filing: 1952-06-05
•
Granted: 1956-04-10
•
Expires: 1972-06-05
Abstract
No abstract record available.
Inventors
- 👤 Alfred L Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:59
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2456360A
Cited
US2546220A
Cited
US2566821A
Cited
US2560680A
Cited
US2587465A
Cited
US2567109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |