Patent US2561493A successfully refreshed from Google Patents.
US2561493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasticized and stabilized cellulose acetate
Assignee: Celanese Corp
•
Filing: 1947-01-17
•
Granted: 1951-07-24
•
Expires: 1967-01-17
Abstract
No abstract record available.
Inventors
- 👤 Amerigo F Caprio
- 👤 Royal L Shuman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/12; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/523
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1607474A
Cited
US1685444A
Cited
US1884433A
Cited
US2202041A
Cited
US2117283A
Cited
US2170833A
Cited
US2280863A
Cited
US2307083A
Cited
US2395083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |