Patent US1256830A successfully refreshed from Google Patents.
US2425774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric dyestuff intermediates and process for obtaining the same
Assignee: EIDP Inc
•
Filing: 1945-01-12
•
Granted: 1947-08-19
•
Expires: 1965-01-12
Abstract
No abstract record available.
Inventors
- 👤 Cyril D Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:11
CPC Classifications
C; C07; C07D; C07D513/00; C07D513/02; C07D513/04; C07D277/00; C07D277/60; C07D277/62; C07D277/64; C07D293/00; C07D293/10; C07D293/12; C09; C09B; C09B23/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB441624A
Cited
US2242224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |