US3825592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenolic aminopolycarboxylic chelants
Assignee: Dow Chemical Co
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Filing: 1971-09-22
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Granted: 1974-07-23
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Expires: 1991-09-22
Abstract
Abstract NEW PHENOLIC AMINOPOLYCARBOXYLIC CHELANTS OF THE FORMULA 2-(MOOC-CH2-N(-R2)-CH(-COOM)-),3,4,5,6-TETRA(R1-)-PHENOL WHEREIN M REPRESENTS HYDROGEN OR ALKALI METAL ION, R1 REPRESENTS HYDROGEN, ALKYL, SO3(M), OR HALOGEN, AND R2 REPRESENTS HYDROGEN OR (-CH2-COO(M)), HAVE BEEN PREPARED WHICH ARE USEFUL IN THE CORRECTION OF IRON DEFICIENCIES IN PLANTS AND IN REMOVAL OF IRON SCALE.
Inventors
- 👤 Crary A Mc
- 👤 D Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:36
CPC Classifications
C; C07; C07C; C07C229/00; C07C229/02; C07C229/34; C07C229/36; A; A01; A01N; A01N37/00; A01N37/44; A01N59/00; A01N59/16; C02; C02F; C02F1/00; C02F1/68; C02F1/683; C07C229/76; Y; Y10; Y10S; Y10S71/00; Y10S71/02
Claims Analysis
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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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |