Patent US2071253A successfully refreshed from Google Patents.
US2071253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear condensation polymers
Assignee: EIDP Inc
•
Filing: 1935-01-02
•
Granted: 1937-02-16
•
Expires: 1955-01-02
Abstract
No abstract record available.
Inventors
- 👤 Wallace H Carothers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:40
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/02; C08G; C08G69/00; C08G69/02; C08G69/08; D; D01; D01F; D01F6/00; D01F6/58; D01F6/60
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-02-16 | 1940-08-17 | 1941-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-02-16 | 1944-08-17 | 1945-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-02-16 | 1948-08-17 | 1949-02-16 | $7700.00 | Window Closed / Lapsed |