US2920939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing phosphates
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-02-14
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Granted: 1960-01-12
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Expires: 1977-02-14
Abstract
No abstract record available.
Inventors
- 👤 James W Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:49
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/40; C01B25/41; C01B25/412
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN THE METHOD OF PRODUCING ALKALI METAL TRIPOLYPHOSPHATES BY CONDENSATION OF A MIXTURE OF PHOSPHATES OTHER THAN TRIPOLYPHOSPHATES AT A TEMPERATURE BELOW THE MELTING POINT OF SAID TRIPOLYPHOSPHATE, SAID PHOSPHATE MIXTURE HAVING AN OVERALL MOLECULAR RATIO OF ALKALI METAL OXIDE TO PHOSPHORUS PENTOXIDE BETWEEN ABOUT 1.5 AND ABOUT 1.8 AND AN OVERALL MOLECULAR RATIO OF ALKALI METAL OXIDE TO WATER OF CONSTITUTION LESS THAN ABOUT 10, THE IMPROVEMENT WHICH COMPRISES ADDING AT LEAST 1 PERCENT BY WEIGHT OF CRYSTALLINE ALKALI METAL TRIPOLYPHOSPHATE TO SAID MIXTURE OF PHOSPHATE, THEREBY ACCELERATING THE RATE OF CONVERSION OF SAID MIXTURE OF PHOSPHATES TO SAID ALKALI METAL TRIPOLYPHOSPHATE.
Claim 2
Dependent Claim
103 words
IN THE METHOD OF PRODUCING ALKALI METAL TRIPOLYPHOSPHATES BY CONDENSATION OF A MIXTURE OF PHOSPHATES OTHER THAN TRIPOLYPHOSPHATES AT A TEMPERATURE BELOW THE MELTING POINT OF SAID TRIPOLYPHOSPHATE, SAID PHOSPHATE MIXTURE HAVING AN OVERALL MOLECULAR RATIO OF ALKALI METAL OXIDE TO PHOSPHORUS PENTOXIDE BETWEEN ABOUT 1.5 AND ABOUT 1.8 AND AN OVERALL MOLECULAR RATIO OF ALKALI METAL OXIDE TO WATER OF CONSTITUTION LESS THAN ABOUT 10, THE IMPROVEMENT WHICH COMPRISES ADDING AT LEAST 1 PERCENT BY WEIGHT OF CRYSTALLINE ALKALI METAL TRIPOLYPHOSPHATE TO SAID MIXTURE OF PHOSPHATE, THEREBY ACCELERATING THE RATE OF CONVERSION OF SAID MIXTURE OF PHOSPHATES TO SAID ALKALI METAL TRIPOLYPHOSPHATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |