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US4810782A
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Di-ureadopyridines and their chelates
Assignee: Individual
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Filing: 1987-11-02
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Granted: 1989-03-07
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Expires: 2007-11-02
Abstract
Abstract Novel chelates of 2,6-diureadopyridines and certain metal ions are provided which exhibit exceptional fluorescent characteristics when such chelates are exposed to incident or X-ray irradiation.
Inventors
- 👤 Spyros Theodoropulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:43
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/72; C07D213/75; C07F; C07F5/00; C07F5/003
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
Ureadopyridine chelates of: (a) a 2,6-diureadopyridine of the formula: ##STR6## (b) a transition metal ion, wherein R represents a substituted or unsubstituted hydrocarbon group of from 1 to 20 carbon atoms; or a substituted or unsubstituted heterocyclic group of up to 20 carbon atoms; and R 1 -R 3 represent hydrogen, F, Cl, Br, I, NO 2 , NO, COOH, SO 3 H, NH 2 , NHNH 2 , or a substituted or unsubstituted aryl, or heteroaryl group of up to 20 carbon atoms, said heterocyclic and heteroaryl groups being composed of carbon, hydrogen and at least one member of the group consisting of oxygen, nitrogen and sulfur.
Claim 2
Dependent Claim
108 words
Ureadopyridine chelates of: (a) a 2,6-diureadopyridine of the formula: ##STR6## (b) a transition metal ion, wherein R represents a substituted or unsubstituted hydrocarbon group of from 1 to 20 carbon atoms; or a substituted or unsubstituted heterocyclic group of up to 20 carbon atoms; and R 1 -R 3 represent hydrogen, F, Cl, Br, I, NO 2 , NO, COOH, SO 3 H, NH 2 , NHNH 2 , or a substituted or unsubstituted aryl, or heteroaryl group of up to 20 carbon atoms, said heterocyclic and heteroaryl groups being composed of carbon, hydrogen and at least one member of the group consisting of oxygen, nitrogen and sulfur.
Claim 3
Dependent Claim
33 words
Ureadopyridine chelates of: (a) a 2,6-diureadopyridine of the formula: ##STR7## (b) a transition metal ion, wherein R represents alkyl of from 1 to 20 carbon atoms and R 1 -R 3 represent hydrogen.
Claim 4
Dependent Claim
33 words
Ureadopyridine chelates of: (a) a 2,6-diureadopyridine of the formula: ##STR7## (b) a transition metal ion, wherein R represents alkyl of from 1 to 20 carbon atoms and R 1 -R 3 represent hydrogen.
Claim 5
Dependent Claim
17 words
The diureadopyridine chelate of claim 2 wherein R represents butyl and R 1 -R 3 represent hydrogen.
Claim 6
Dependent Claim
14 words
The diureadopyridine chelate of claim 1 wherein the transition metal ion is a lanthanide.
Claim 7
Dependent Claim
13 words
The diureadopyridine chelate of claim 1 wherein the transition metal ion is terbium.
Claim 8
Dependent Claim
13 words
The diureadopyridine chelate of claim 1 wherein the transition metal ion is europium.
Claim 9
Dependent Claim
13 words
The diureadopyridine chelate of claim 1 wherein the transition metal ion is indium.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |