Patent US4202944A successfully refreshed from Google Patents.
US4202944A
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Selective ion exchange resins with pyridyl-imidazolyl chelating functional groups
Assignee: NATIONAL INSTITUTE FOR METALLURGY
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Filing: 1978-09-07
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Granted: 1980-05-13
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Expires: 1998-09-07
Abstract
Abstract An ion exchange resin having functional groups of the formula :- <IMAGE> wherein :- A and B, independently of each other, represent groups forming together with the attached carbon and nitrogen atoms, an optionally substituted five or six membered heterocyclic ring which may embody a further heteroatom and wherein at least one of such heterocyclic rings is an aromatic ring; R* may be totally absent or it may represent an optionally substituted alkyl radical and Z represents a resin to which the functional groups are attached.
Inventors
- 👤 Robert D. Hancock
- 👤 Roy F. Bond
- 👤 Brian R. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:25
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; B; B01; B01J; B01J45/00; C01; C01G; C01G3/00; C01G3/003; C01G53/00; C01G53/01; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
An ion exchange resin having functional groups of the formula: ##STR5## wherein: A and B, independently of each other, represent groups forming together with the attached carbon and nitrogen atoms, an optionally substituted five or six membered heterocyclic ring independent of each other and selected from the group consisting of optionally substituted pyridyl, imidazole and imidazolyl groups; R* may be totally absent or it may represent an optionally substituted alkyl radical and Z represents a resin to which the functional groups are attached.
Claim 2
Dependent Claim
83 words
An ion exchange resin having functional groups of the formula: ##STR5## wherein: A and B, independently of each other, represent groups forming together with the attached carbon and nitrogen atoms, an optionally substituted five or six membered heterocyclic ring independent of each other and selected from the group consisting of optionally substituted pyridyl, imidazole and imidazolyl groups; R* may be totally absent or it may represent an optionally substituted alkyl radical and Z represents a resin to which the functional groups are attached.
Claim 3
Dependent Claim
20 words
Ion exchange resins as claimed in claim 1 in which one heterocyclic ring is pyridyl and the other is imidazolyl.
Claim 4
Dependent Claim
20 words
Ion exchange resins as claimed in claim 1 in which one heterocyclic ring is pyridyl and the other is imidazoline.
Claim 5
Dependent Claim
25 words
Ion exchange resins as claimed in claim 1 in which said heterocyclic rings are substituted by at least one methyl, chloro bromo or methoxy groups.
Claim 6
Dependent Claim
21 words
Ion exchange resins as claimed in claim 1 in which the resin itself is a styrene matrix cross-linked with di-vinyl benzene.
Claim 7
Dependent Claim
16 words
Ion exchange resins as claimed in claim 5 in which the resin is a macroporous resin.
Claim 8
Dependent Claim
27 words
An ion exchange resin having repeating functional groups of the formula: ##STR6## wherein R' is hydrogen or bromine and R" is hydrogen, methyl, chloro, bromo or methoxy.
Claim 9
Dependent Claim
27 words
An ion exchange resin having repeating functional groups of the formula: ##STR6## wherein R' is hydrogen or bromine and R" is hydrogen, methyl, chloro, bromo or methoxy.
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) | 1983-05-13 | 1983-11-12 | 1984-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-13 | 1987-11-12 | 1988-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-13 | 1991-11-12 | 1992-05-13 | $7700.00 | Window Closed / Lapsed |