US3183262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of sodium nitrilo triacetate
Assignee: Hampshire Chemical Corp
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Filing: 1961-10-25
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Granted: 1965-05-11
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Expires: 1981-10-25
Abstract
No abstract record available.
Inventors
- 👤 John J Singer
- 👤 James P Singer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:54
CPC Classifications
C; C07; C07F; C07F1/00; C07F1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A METHOD OF CONVERTING NITRILO TRIACETO NITRILE INTO SODIUM NITRILO TRIACETATE AS ITS HYDROLYSIS PRODUCT, WHICH COMPRISES PROVIDING NITRILO TRIACETO NITRILE, A STOICHIOMETRIC QUANTITY OF SODIUM HYDROXIDE, AND SODIUM NITRILO TRIACETATE IN SOLUTION IN AN AMOUNT CORRESPONDING TO THE REACTION PRODUCT OF SAID NITRILO TRIACETO NITRILE AND SODIUM HYDROXIDE, ADDING THE SODIUM HYDROXIDE TOTHE AQUEOUS SOLUTION OF SODIUM NITRILO TRIACETATE, THEREBY TO PROVIDE A SOLUTION HAVING ABOUT 15-20% FREE SODIUM HYDROXIDE THEREIN, SEPARATING CRYSTALS OF SODIUM NITRILO TRIACETATE FORMED, THEREBY TO PROVIDE A MOTHER LIQUOR CONTAINING FREE SODIUM HYDROXIDE AND A RESIDULA SMALL AMOUNT OF SODIUM NITRILO TRIASCETATE, ADDING TO SAID MOTHER LIQUOR NITRILO TRIACETO NITRILE TO FORM A SLURRY, HYDROLYZING SAID NITRILE TO FORM A SOLUTION OF SODIUM NITRILO TRIACETATE AND, THEREAFTER, REPEATING THE CYCLE.
Claim 2
Independent Claim
126 words
A METHOD OF CONVERTING NITRILO TRIACETO NITRILE INTO SODIUM NITRILO TRIACETATE AS ITS HYDROLYSIS PRODUCT, WHICH COMPRISES PROVIDING NITRILO TRIACETO NITRILE, A STOICHIOMETRIC QUANTITY OF SODIUM HYDROXIDE, AND SODIUM NITRILO TRIACETATE IN SOLUTION IN AN AMOUNT CORRESPONDING TO THE REACTION PRODUCT OF SAID NITRILO TRIACETO NITRILE AND SODIUM HYDROXIDE, ADDING THE SODIUM HYDROXIDE TOTHE AQUEOUS SOLUTION OF SODIUM NITRILO TRIACETATE, THEREBY TO PROVIDE A SOLUTION HAVING ABOUT 15-20% FREE SODIUM HYDROXIDE THEREIN, SEPARATING CRYSTALS OF SODIUM NITRILO TRIACETATE FORMED, THEREBY TO PROVIDE A MOTHER LIQUOR CONTAINING FREE SODIUM HYDROXIDE AND A RESIDULA SMALL AMOUNT OF SODIUM NITRILO TRIASCETATE, ADDING TO SAID MOTHER LIQUOR NITRILO TRIACETO NITRILE TO FORM A SLURRY, HYDROLYZING SAID NITRILE TO FORM A SOLUTION OF SODIUM NITRILO TRIACETATE AND, THEREAFTER, REPEATING THE CYCLE.
References Cited (Backward Citations)
US2845457A
Cited
US2855438A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-10 | 1968-11-09 | 1969-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-10 | 1972-11-09 | 1973-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-10 | 1976-11-09 | 1977-05-11 | $7700.00 | Window Closed / Lapsed |