US2420730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of polymers with acylamides and aldehydes
Assignee: EIDP Inc
•
Filing: 1944-06-09
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Granted: 1947-05-20
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Expires: 1964-06-09
Abstract
No abstract record available.
Inventors
- 👤 David W Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:50
CPC Classifications
C; C08; C08B; C08B13/00; C08B11/00; C08B11/02; C08B11/04; C08B11/14; C08G; C08G12/00; C08G12/02; C08G12/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1672848A
Cited
GB361910A
Cited
US1954729A
Cited
US2118685A
Cited
US2270841A
Cited
US2331376A
Cited
US2332302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |