US3901831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making dense detergent granules
Assignee: Monsanto Co
•
Filing: 1973-08-24
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Granted: 1975-08-26
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Expires: 1993-08-24
Abstract
Abstract Dense, free-flowing composite detergent additive granules are prepared by contacting hot inorganic salts such as sodium tripolyphosphate with aqueous alkali metal nitrilotriacetate under controlled conditions.
Inventors
- 👤 Chung Y Shen
- 👤 Clayton F Callis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:51
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/32; C11D7/3245; C11D11/00; C11D11/0082; C11D17/00; C11D17/06; C11D7/02; C11D7/04; C11D7/10; C11D7/12; C11D7/14; C11D7/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A METHOD OF MAKING COMPOSITE DETERGENT ADDITIVE GRANULES CONTAINING FROM 3% TO 20% ALKALI METAL NITRILOTRIACETATE THE BALANCE OF SAID GRANULES BEING AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM METASILICATE, SODIUM CARBONATE, SODIUM SULFATE, MIXTURES THEREOF, STP AND MIXTURES OF STP AND SODIUM SULFATE, SAID METHOD COMPRISING ADDING AQUEOUS ALKALI METAL NITRILOTRIACETATE, CONTAINING FROM ABOUT 40% TO ABOUT 70% BY WEIGHT ALKALI METAL NITRILOTRIACETATE AND HAVING A TEMPERATURE OF FROM ABOUT 0*C TO ABOUT 120*C, TO AN AGITATED BED OF THE INORGANIC SALT, HAVING AN INTIAL TEMPERATURE OF FROM ABOUT 300*C TO ABOUT 550*C, SUFFICIENT AQUEOUS NITRILOTRIACETATE BEINT ADDED TO COOL THE BED BELOW ABOUT 300*C PRIOR TO DEHYDRATION OF THE BED AN THE ADDITION OF AQUEOUS NITRILOTRIACETATE AND DEHYDRATION OF THE BED BEING COMPLETE AT A BED TEMPERATURE OF AT LEAST ABOUT 160*C WHEN STP IS PRESENT OR ABOUT 120*C WHEN STP IS NOT PRESENT.
Claim 2
Independent Claim
149 words
A METHOD OF MAKING COMPOSITE DETERGENT ADDITIVE GRANULES CONTAINING FROM 3% TO 20% ALKALI METAL NITRILOTRIACETATE THE BALANCE OF SAID GRANULES BEING AN INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM METASILICATE, SODIUM CARBONATE, SODIUM SULFATE, MIXTURES THEREOF, STP AND MIXTURES OF STP AND SODIUM SULFATE, SAID METHOD COMPRISING ADDING AQUEOUS ALKALI METAL NITRILOTRIACETATE, CONTAINING FROM ABOUT 40% TO ABOUT 70% BY WEIGHT ALKALI METAL NITRILOTRIACETATE AND HAVING A TEMPERATURE OF FROM ABOUT 0*C TO ABOUT 120*C, TO AN AGITATED BED OF THE INORGANIC SALT, HAVING AN INTIAL TEMPERATURE OF FROM ABOUT 300*C TO ABOUT 550*C, SUFFICIENT AQUEOUS NITRILOTRIACETATE BEINT ADDED TO COOL THE BED BELOW ABOUT 300*C PRIOR TO DEHYDRATION OF THE BED AN THE ADDITION OF AQUEOUS NITRILOTRIACETATE AND DEHYDRATION OF THE BED BEING COMPLETE AT A BED TEMPERATURE OF AT LEAST ABOUT 160*C WHEN STP IS PRESENT OR ABOUT 120*C WHEN STP IS NOT PRESENT.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the aqueous alkali metal nitrilotriacetate has a temperature of 80* to 110*C.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the inorganic salt has a temperature of from about 400*C to about 500*C.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the aqueous alkali metal nitrilotriacetate contains 40 to 50% nitrilotriacetate.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the inorganic salt is sodium tripolyphosphate.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the alkali metal nitrilotriacetate is trisodium nitrilotriacetate.
References Cited (Backward Citations)
US3620979A
Cited
US3639289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |