Patent US2581812A successfully refreshed from Google Patents.
Patent US4698431A successfully refreshed from Google Patents.
US4698431A
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Hydroxypyridonate chelating agents
Assignee: United States Department of Energy
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Filing: 1985-11-12
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Granted: 1987-10-06
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Expires: 2005-11-12
Abstract
Abstract Chelating agents having 1-hydroxy-2-pyridinone (HOPO) and related moieties incorporated within their structures, including polydentate HOPO-substituted polyamines such as spermidine and spermine, and HOPO-substituted desferrioxamine. The chelating agents are useful in selectively removing certain cations from solution, and are particularly useful as ferric ion and actinide chelators. Novel syntheses of the chelating agents are provided.
Inventors
- 👤 Kenneth N. Raymond
- 👤 Robert C. Scarrow
- 👤 David L. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:06
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/89
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
54 words
A chelating agent having the structure: ##STR12## wherein R is a hydroxy group or ##STR13## where R 1 and R 2 are selected from the group consisting of H, --CH 3 , --CH 2 CH 3 and --CH 2 --φ, and X is either hydrogen, an alkali metal ion, or a quaternary ammonium ion.
Claim 2
Dependent Claim
54 words
A chelating agent having the structure: ##STR12## wherein R is a hydroxy group or ##STR13## where R 1 and R 2 are selected from the group consisting of H, --CH 3 , --CH 2 CH 3 and --CH 2 --φ, and X is either hydrogen, an alkali metal ion, or a quaternary ammonium ion.
Claim 3
Dependent Claim
10 words
The chelating agent of claim 1, wherein R is ##STR14##
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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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |