US3703545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyalkylenepolyamines with n-(2-hydroxy-3-sulfopropyl) groups
Assignee: Dow Chemical Co
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Filing: 1970-07-02
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Granted: 1972-11-21
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Expires: 1990-07-02
Abstract
Abstract POLYALKYLENEPOLYAMINES WHEREIN THE AMINO HYDROGEN ATOMS HAVE BEEN REPLACED BYCARBOXYMETHYL AND 2-HYDROXY-3-SULFOPROPYL GROUPS ARE EFFECTIVE IRON CHELATING AGENTS USEFUL FOR PROMOTING PLANT GROWTH. THOSE COMPOUNDS WHERE MOST OF THE SUBSTITUENTS ARE 2-HYDROXY-3SULFOPROPYL GROUPS HAVE SUPERIOR IRON CHELATING CAPACITY, PARTICULARLY AT HIGH PH LEVELS.
Inventors
- 👤 Avis L Mccrary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:56
CPC Classifications
C; C05; C05D; C05D9/00; C05D9/02; Y; Y10; Y10S; Y10S71/00; Y10S71/02
Claims Analysis
Total Claims: 0
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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) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |