Patent US3262883A successfully refreshed from Google Patents.
US3262883A
Expired / Lapsed
US
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Defouling ion exchange resins by the removal of iron oxides therefrom
Assignee: Rohm and Haas Co
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Filing: 1962-11-13
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Granted: 1966-07-26
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Expires: 1982-11-13
Abstract
No abstract record available.
Inventors
- 👤 Sallie A Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:39
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/60; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD FOR DEFOULING WITHOUT DELETERIOUSLY EFFECTING ION EXCHANGERS BY REMOVING IRON OXIDE WHICH IS DEPOSITED WITHIN THEIR GEL STRUCTURE, COMPRISING CONTACTING THE IRON OXIDE ON THE SUBSTANCE BEARING SAME WITH AN AQUEOUS SOLUTION OF AT LEAST 0.01% OF A WATER-SOLUBLE DITHIONITE SALT AND AT LEAST 0.01% OF A CHELATING AGENT FROM THE CLASS CONSISTING OF SODIUM AND POTASSIUM POLYPHOSPHATES AND ETHYLENEDIAMINE TETRAACETIC ACID FOR SUCH TIME AS IS NECESSARY TO REMOVE THE IRON OXIDE FROM SAID SUBSTANCE TO THE EXTENT DESIRED.
Claim 2
Independent Claim
82 words
A METHOD FOR DEFOULING WITHOUT DELETERIOUSLY EFFECTING ION EXCHANGERS BY REMOVING IRON OXIDE WHICH IS DEPOSITED WITHIN THEIR GEL STRUCTURE, COMPRISING CONTACTING THE IRON OXIDE ON THE SUBSTANCE BEARING SAME WITH AN AQUEOUS SOLUTION OF AT LEAST 0.01% OF A WATER-SOLUBLE DITHIONITE SALT AND AT LEAST 0.01% OF A CHELATING AGENT FROM THE CLASS CONSISTING OF SODIUM AND POTASSIUM POLYPHOSPHATES AND ETHYLENEDIAMINE TETRAACETIC ACID FOR SUCH TIME AS IS NECESSARY TO REMOVE THE IRON OXIDE FROM SAID SUBSTANCE TO THE EXTENT DESIRED.
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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) | 1969-07-25 | 1970-01-24 | 1970-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-25 | 1974-01-24 | 1974-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-25 | 1978-01-24 | 1978-07-26 | $7700.00 | Window Closed / Lapsed |