Patent US3302698A successfully refreshed from Google Patents.
US3148947A
Expired / Lapsed
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Method for the separation of a complexing agent and a metallic ion from their complex
Assignee: Individual
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Filing: 1956-07-10
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Granted: 1964-09-15
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Expires: 1976-07-10
Abstract
No abstract record available.
Inventors
- 👤 Herbert J Fleischmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:35
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/05; B01J49/07
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
143 words
A METHOD FOR THE RECOVERY OF THE CUPRIC ION AND A SALT OF ETHYLENE DIAMINE TETRA-ACETIC ACID FROM AN AQUEOUS SOLUTION OF THE CUPRIC SALT OF THE SAID ACID FORMED AS A BY-PRODUCT OF AN ION EXCHANGE SEPARATION PROCESS WHICH COMPRISES THE STEPS OF ADSORBING THE SALT ON AN ION EXCHANGE RESIN OF THE ANIONIC TYPE, SPLITTING THE SALT AND ELUTING THE CUPRIC ION FROM THE ION EXCHANGE RESIN WHILE LEAVING THE ETHYLENE DIAMINE TETRA-ACETIC ACID ADSORBED THEREON BY TREATING THE RESIN WITH AN AQEUOUS SOLUTION OF A WATER-SOLUBLE ACID AND RECOVERING THE RESULTING AQUEOUS SOLUTION OF THE CUPRIC SALT, WASHING THE RESIN FREE OF ANY RESIDUAL ACID AND SALT, TREATING THE RESIN WITH AN AQUEOUS SOLUTION OF A WATER-SOLUBLE BASE TO ELUTE THEREFROM THE ETHYLENE DIAMINE TETRA-ACETIC ACID AND RECOVERING THE RESULTING AQUEOUS SOLUTION OF THE SALT OF ETHYLENE DIAMINE TETRA-ACETIC ACID.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |