US2277861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of diamidine derivatives
Assignee: May and Baker Ltd
•
Filing: 1938-12-05
•
Granted: 1942-03-31
•
Expires: 1958-12-05
Abstract
No abstract record available.
Inventors
- 👤 Ewins Arthur James
- 👤 Barber Harry James
- 👤 Ashley Julius Nicholson
- 👤 Self Alan David Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:46
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/38
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) | 1945-03-30 | 1945-09-29 | 1946-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-30 | 1949-09-29 | 1950-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-30 | 1953-09-29 | 1954-03-31 | $7700.00 | Window Closed / Lapsed |