Patent US3873668A successfully refreshed from Google Patents.
US3873668A
Expired / Lapsed
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Cupric, nickelous and argentous ion-selective chelating resins
Assignee: EIDP Inc
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Filing: 1973-03-27
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Granted: 1975-03-25
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Expires: 1993-03-27
Abstract
Abstract A polymer-ligand comprising a high molecular weight water insoluble polymer containing certain covalently bonded ligand moieties is capable of selectively chelating cupric and/or argentous ions from aqueous solutions containing them and other metal ions. Exemplary is polystyrene containing the moiety WHICH IS BOUND TO THE POLYMER CHAIN THROUGH THE OXYGEN ATOM.
Inventors
- 👤 Lester Russell Melby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:30
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; B; B01; B01J; B01J45/00; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
31 words
A POLYMER-LIGAND COMPRISING A HIGH MOLECULAR WEIGHT WATER INSOLUBLE POLYMER CONTAINING ABOUT 0.3 TO ABOUT 2 MILLIMOLES OF A COVALENTLY BONDED LIGAND PER GRAM OF POLYMER, THE LIGAND HAVING THE FORMULA
Claim 2
Dependent Claim
31 words
A POLYMER-LIGAND COMPRISING A HIGH MOLECULAR WEIGHT WATER INSOLUBLE POLYMER CONTAINING ABOUT 0.3 TO ABOUT 2 MILLIMOLES OF A COVALENTLY BONDED LIGAND PER GRAM OF POLYMER, THE LIGAND HAVING THE FORMULA
Claim 3
Dependent Claim
21 words
A polymer-ligand according to claim 1 in which the said indicated valence bond is ortho to the Q or Q'' atom.
Claim 4
Dependent Claim
14 words
A polymer-ligand according to claim 1 in which X and X'' are each N.
Claim 5
Dependent Claim
12 words
A polymer-ligand according to claim 1 in which the polymer is polystyrene.
Claim 6
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the polymer is crosslinked polystyrene.
Claim 7
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the ligand has the formula
Claim 8
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the ligand has the formula
Claim 9
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the ligand has the formula
Claim 10
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the ligand has the formula
Claim 11
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the ligand has the formula
Claim 12
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the ligand has the formula
Claim 13
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the ligand has the formula
Claim 14
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the ligand has the formula
Claim 15
Dependent Claim
13 words
A polymer-ligand according to claim 1 in which the ligand has the formula
Claim 16
Dependent Claim
55 words
The process of removing cupric or argentous ions from their aqueous solution which also contains other metal ions, which comprises contacting said aqueous solution with a polymer-ligand according to claim 1 to selectively bind cupric or argentous ions to the polymer-ligand, removing the polymer-ligand containing the bound ions, and recovering the ions from the polymer-ligand.
Claim 17
Dependent Claim
21 words
The process of claim 15 in which sulfuric acid of 1-25% strength is used to recover the ions from the polymer-ligand.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |