Patent US3772374A successfully refreshed from Google Patents.
US3772374A
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US
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Process for preparing alkali metal nitrilotriacetates
Assignee: Monsanto Co
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Filing: 1971-08-09
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Granted: 1973-11-13
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Expires: 1991-08-09
Abstract
Abstract A PROCESS IS DESCRIBED FOR PREPARING ALKALI METAL NITRILOTRIACETATE BY HYDROLYZING NITRILOTRIACETONITRILE DISSOLVED IN AN AQUEOUS SOLUTION CONTAING AN ALKALI METAL HYDROXIDE AT A TEMPERATURE OF FROM ABOUT 90*C. TO AOUT 150*C. WITH THE ALKALI METAL HYDROXIDE BEING IN AN EXCESS AMOUNT SUFFICIENT TO RAPIDLY CONVERT SAID NITRILE TO ALKALI METAL NITRILOTRIACETATE AND FORM AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION CONTAING ALKALI METAL NITRILOTRIACETATE CRYSTALS, AND RECOVERING THE ALKALI METAL NITRILOTRIACETATE CRYSTALS FROM THE SOLUTION.
Inventors
- 👤 C Shen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:50
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/16; C11D3/26; C11D3/33
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |