Production of metal chelates
Abstract
Abstract AN ALKALI METAL SALT OF A POLYVALENT METAL CHELATE OF A CHELATING AMINOACETIC ACID IS FORMED BY: (1) BOILING A MIXTURE OF; (A) WATER; (B) AN AMINE PRECURSOR OF THE SAID ACID; (C) FORMALDEHYDE; (D) A CYANIDE OF THE POLYVALENT METAL; (E) AN ALKALI METAL HYDROXIDE; AND (F) AN ALKALI METAL CYANIDE, AND ADDING THERETO THE CHELATING AMINOACETIC ACID IN ITS FREE FORM TO REACT WITH UNREACTED POLYVALENT METAL CYANIDE. (2) BOILING A MIXTURE OF; (A) WATER; (B) AN AMINE PRECURSOR OF THE SAID ACID; (C) FORMALDEHYDE; (D) A POLYVALENT METAL HYDROXIDE OR OXIDE; (E) AN ALKALI METAL HYDROXIDE; AND (F) HYDROGEN CYANIDE AND ADDING THERETO THE CHELATING AMINOACETIC ACID IN ITS FREE FORM TO REACT WITH UNREACTED POLYVALENT METAL HYDROXIDE OR OXIDE.
Inventors
- 👤 Felix B Popper
- 👤 Albert H Levesque
Bibliographic Details
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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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |