US2428353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lower aliphatic esters of ethylene-and propylene-diamine n,n'-tetracetic acids
Assignee: Individual
•
Filing: 1943-06-21
•
Granted: 1947-10-07
•
Expires: 1963-06-21
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Bersworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:04
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/175
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE272290C
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US2103558A
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US2135641A
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US2192994A
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US2249134A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |