US2898189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing alkali metal triphosphates, alkali metal pyrophosphates and mixtures thereof
Assignee: Knapsack AG
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Filing: 1955-03-07
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Granted: 1959-08-04
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Expires: 1975-03-07
Abstract
No abstract record available.
Inventors
- 👤 Rodis Franz
- 👤 Hartlapp Gerhard
- 👤 Beltz Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:47
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/38; C01B25/42; C01B25/425
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A PROCESS FOR PREPARING ALKALI METAL TRIPHOSPHATES, ALKALI METAL PYROPHOSPHATES AND MIXTURES THEREOF, SAID PROCESS BEING CHRACTERIZED BY THE STEPS OF PROVIDING AN AQUEOUS SOLUTION OF PHOSPHORIC ACID THAT HAS BEEN NEUTRALIZED TO FORM ALKALI METAL SALTS, THE MOLAR PROPORTION OF ORTHOPHOSPHORIC ACID RELATIVE TO THE ALKALI METAL IN THE SOLUTION BEING BETWEEN 1:2 AND 3:5, AND CONVERTING THE SOLUTION TO THE DESIRED PRODUCT BY SPRAYING SAID SOLUTION IN THE REACTION ZONE WHILE SIMULTANEOUSLY HEATING SAID SOLUTION TO A TEMPERATURE SUFFICIENT TO FORM WASTE GASES HAVING A TEMPERATURE OF BETWEEN 200* C. AND 500* C., THERE BEING A SUFFICIENT AMOUNT OF WATER PRESENT IN SAID AQUEOUS SOLUTION TO PROVIDE A WATER CONTENT IN SAID WASTE GASES OF ABOUT 60-400 GRAMS OF WATER FOR EACH KILO OF WASTE GASES, AND THE CONVERSION TAKING PLACE WITHIN A PERIOD OF ABOUT 1-15 SECONDS.
Claim 2
Dependent Claim
140 words
A PROCESS FOR PREPARING ALKALI METAL TRIPHOSPHATES, ALKALI METAL PYROPHOSPHATES AND MIXTURES THEREOF, SAID PROCESS BEING CHRACTERIZED BY THE STEPS OF PROVIDING AN AQUEOUS SOLUTION OF PHOSPHORIC ACID THAT HAS BEEN NEUTRALIZED TO FORM ALKALI METAL SALTS, THE MOLAR PROPORTION OF ORTHOPHOSPHORIC ACID RELATIVE TO THE ALKALI METAL IN THE SOLUTION BEING BETWEEN 1:2 AND 3:5, AND CONVERTING THE SOLUTION TO THE DESIRED PRODUCT BY SPRAYING SAID SOLUTION IN THE REACTION ZONE WHILE SIMULTANEOUSLY HEATING SAID SOLUTION TO A TEMPERATURE SUFFICIENT TO FORM WASTE GASES HAVING A TEMPERATURE OF BETWEEN 200* C. AND 500* C., THERE BEING A SUFFICIENT AMOUNT OF WATER PRESENT IN SAID AQUEOUS SOLUTION TO PROVIDE A WATER CONTENT IN SAID WASTE GASES OF ABOUT 60-400 GRAMS OF WATER FOR EACH KILO OF WASTE GASES, AND THE CONVERSION TAKING PLACE WITHIN A PERIOD OF ABOUT 1-15 SECONDS.
References Cited (Backward Citations)
US1984968A
Cited
US1984146A
Cited
US1998182A
Cited
GB495192A
Cited
US2182357A
Cited
US2776187A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |