Patent US5632756A successfully refreshed from Google Patents.
US2552329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly-enolic organic compounds used to modify physical properties of thermoplastic polymers
Assignee: Wyeth Holdings LLC
•
Filing: 1947-07-25
•
Granted: 1951-05-08
•
Expires: 1967-07-25
Abstract
No abstract record available.
Inventors
- 👤 Edward L Kropa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:51
CPC Classifications
C; C08; C08F; C08F120/00; C08F120/02; C08F120/10; C08F120/12; C08F120/16; C08F120/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |