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Patent US3661960A successfully refreshed from Google Patents.
US3661960A
Expired / Lapsed
US
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Synergistic metal sequestrant
Assignee: Hooker Chemical Corp
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Filing: 1970-07-13
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Granted: 1972-05-09
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Expires: 1990-07-13
Abstract
Abstract MIXTURES OF TRIS(HYDROXYMETHYL) PHOSPHINE OXIDE, AND TRIS(N,N-DIACEOAMINOMETHYL) PHOSPHINE AS WELL AS THE ALKALI METAL SALTS THEREOF, EXHIBITS MARKED SYNERGISM AS SEQUESTRANT COMPOSITIONS OVER A BROAD PH RANGE. THE SEQUESTRANT COMPOSITION ARE USEFUL AS ADDITIVES FOR DETERGENTS, METAL CLEANING BATHS, PEROXIDE COMPOSITIONS AND DYES, THE CHELATE PRODUCTS ARE USEFUL IN THE FIELD OF AGRICULTURE FOR THE INTRODUCTION OF TRACE ELEMENTS INTO PLANT LIFE AND ESPECIALLY IN THE TREATMENT OF IRON CHLOROSIS IN PLANTS.
Inventors
- 👤 Ronald H Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:04
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/36; B; B01; B01J; B01J45/00; C01; C01B; C01B15/00; C01B15/01; C01B15/037; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C02F5/145; C05; C05D; C05D9/00; C05D9/02; C07; C07F; C07F15/00; C07F15/02; C07F15/025; C07F9/00; C07F9/02; C07F9/28; C07F9/50; C07F9/5004; C07F9/53
Claims Analysis
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |