Process for producing granular alkali metal nitrilotriacetate
Abstract
Abstract CAKING-RESISTANT GRANULAR ALKALI METAL NITRILOTRIACETATE PRODUCTS ARE PREPARED BY FORMING A REACTION MIXTURE OF NITRILOTRIACETIC ACID AND ALKALI METAL CARBONATE AND WATER; THE MOLAR RATIO OF NITRILOTRIACETIC ACID TO THE ALKALI METAL CONTENT OF SAID CARBONATE BEING FROM ABOUT 1:2 TO ABOUT 1:20, SAID WATER COMPRISING FROM ABOUT 5% TO ABOUT 35% BY WEIGHT BASED UPON THE WEIGHT OF THE TOTAL REACTION MEDIUM AND DRYING THE RESULTING MIXTURE TO OBTAIN A DETERGENT ADDITIVE CONTAINING DIALKALI METAL NITRILOTRIACETATE AND HAVING A BULK DENSITY OF FROM ABOUT 0.4 TO ABOUT 0.8 G./CC. AND HAVING ABOUT 60% OF ITS PARTICLES SMALLER THAN THE OPENINGS IN A U.S. STANDARD 10 MESH SCREEN AND ABOUT 60% LARGER THAN THE OPENINGS IN A U.S. STANDARD 60 MESH SCREEN AND LESS THAN ABOUT 8% BY WEIGHT OF WATER.
Inventors
- 👤 Chung Yu Shen
- 👤 Norman Earl Stahlheber
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |