US3790610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic polymer chelants for iron and manganese ions
Assignee: Colloids Inc
•
Filing: 1971-09-07
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Granted: 1974-02-05
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Expires: 1991-09-07
Abstract
Abstract PROCESS FOR SOLUBLE POLYMERIC CHELATES OF IRON AND MANGANESE WHICH COMPRISES REACTING IRON AND/OR MANGANESE IONS WITH POLYMERS AND COPOLYMERS BASED ON ORGANIC MONOMERIC ACIDS, THE POLYMERS AND COPOLYMERS PREFERABLY HAVING RELATIVELY LOW MOLECULAR WEIGHTS OF LESS THAN 50,000, THE CHELATION PROCESS BEING APPLICABLE AT A WIDE RANGE OF PH VALUES OF THE ION CONTAINING SOLUTION, COMPOSITIONS OF POLYMERIC CHELATES PREPARED THEREBY AND USES THEREFOR.
Inventors
- 👤 J Lum
- 👤 R Beyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
C; C01; C01G; C01G49/00; C07; C07F; C07F13/00; C07F13/005; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |