Patent US3794591A successfully refreshed from Google Patents.
US3794591A
Expired / Lapsed
US
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Sequestering agent solutions stabilized with lithium ions
Assignee: Eastman Kodak Co
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Filing: 1972-02-08
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Granted: 1974-02-26
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Expires: 1992-02-08
Abstract
Abstract THE INCORPORATION OF SMALL AMOUNTS OF LITHIUM ION INTO A SOLUTION OF A HEAVY METAL SEQUESTERING AGENT OF THE FORMULA: HO-P(=O)(-OH)-C(-R)(-OH)-P(=O)(-OH)2 WHEREIN R IS A LOWER ALKYL RADICAL HAVING FROM 1 TO 5 CARBON ATOMS, INHIBITS THE FORMATION OF THE WHITE PRECIPITATE CHARACTERISTICALLY PRODUCED WHEN SEQUESTRANTS OF THIS TYPE ARE USED TO SEQUESTER IONS OF HEAVY METALS SUCH AS CALCIUM. ALKALI METAL, AMMONIUM AND ETHANOLAMINE SALTS OF COMPOUNDS OF THE ABOVE FORMULA AND MONO AND DIALKYL ESTERS THEREOF WITH METHANOL, ETHANOL, PROPANOL AND BUTANOL ALSO PROVIDE USEFUL SEQUESTERING AGENTS.
Inventors
- 👤 J Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:18
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/3053; C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C02F5/145
Claims Analysis
Total Claims: 0
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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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |