US2419157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethylenebisiminodiacetic acid and salts thereof
Assignee: Imperial Chemical Industries Ltd
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Filing: 1944-07-21
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Granted: 1947-04-15
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Expires: 1964-07-21
Abstract
No abstract record available.
Inventors
- 👤 Parry Edryd Gwylfa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:19
CPC Classifications
C; C07; C07C; C07C227/00; C07C227/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22352E
Cited
US2206249A
Cited
US2097864A
Cited
GB446737A
Cited
US2168181A
Cited
US2261002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-14 | 1950-10-14 | 1951-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-14 | 1954-10-14 | 1955-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-14 | 1958-10-14 | 1959-04-15 | $7700.00 | Window Closed / Lapsed |