Patent US3477953A successfully refreshed from Google Patents.
US3477953A
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Sequestration of metal ions with hydroxyalkyl phosphine oxides
Assignee: Hooker Chemical Corp
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Filing: 1966-11-29
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Granted: 1969-11-11
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Expires: 1986-11-29
Abstract
No abstract record available.
Inventors
- 👤 Ronald H Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:53
CPC Classifications
C; C23; C23G; C23G1/00; C01; C01B; C01B15/00; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/30; C07F9/301; C07F9/38; C07F9/3804; C07F9/3808; C07F9/50; C07F9/53; C07F9/5304; C11; C11D; C11D3/00; C11D3/16; C11D3/36; C11D3/39; C11D3/3902; C11D3/3937; C11D3/394
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2758971A
Cited
US3291840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |