Patent US2986449A successfully refreshed from Google Patents.
US2986449A
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US
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Process for the production of alkali metal polyphosphates
Assignee: Knapsack AG
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Filing: 1956-11-07
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Granted: 1961-05-30
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Expires: 1976-11-07
Abstract
No abstract record available.
Inventors
- 👤 Rodis Franz
- 👤 Beltz Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:38
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
122 words
A PROCESS FOR THE PRODUCTION OF ALKALI METAL POLYPHOSPHATES HAVING A BULK WEIGHT OF BETWEEN ABOUT 250 GRAMS AND ABOUT 600 GRAMS PER LITER, WHICH COMPRISES HEATING AT LEAST ONE ALKALI METAL ORTHOPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF MONO-ALKALI METAL ORTHOPHOSPHATE AND DI-ALKALI METAL ORTHOPHOSPHATE TO TEMPERATURES BETWEEN ABOUT 200*C. AND ABOUT 500*C. IN THE PRESENCE OF ABOUT 0.03 TO ABOUT 5 PERCENT OF AN ALKALI METAL SALT OF AT LEAST ONE ACID OF PHOSPHORUS SELECTED FROM THE GROUP CONSISTING OF PHOSPHOROUS ACID AND HYPOPHOSPHOROUS ACID, THE PERCENTAGE AMOUNT OF ALKALI METAL SALT BEING CALCUALTED UPON THE QUANTITY OF ALKALI METAL ORHOPHOSPHATE PRESENT, AND RECOVERING ALKALI METAL POLYPHOSPHATES HAVING A BULK WEIGHT OF BETWEEN 250 AND ABOUT 600 GRAMS PER LITER.
Claim 2
Dependent Claim
122 words
A PROCESS FOR THE PRODUCTION OF ALKALI METAL POLYPHOSPHATES HAVING A BULK WEIGHT OF BETWEEN ABOUT 250 GRAMS AND ABOUT 600 GRAMS PER LITER, WHICH COMPRISES HEATING AT LEAST ONE ALKALI METAL ORTHOPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF MONO-ALKALI METAL ORTHOPHOSPHATE AND DI-ALKALI METAL ORTHOPHOSPHATE TO TEMPERATURES BETWEEN ABOUT 200*C. AND ABOUT 500*C. IN THE PRESENCE OF ABOUT 0.03 TO ABOUT 5 PERCENT OF AN ALKALI METAL SALT OF AT LEAST ONE ACID OF PHOSPHORUS SELECTED FROM THE GROUP CONSISTING OF PHOSPHOROUS ACID AND HYPOPHOSPHOROUS ACID, THE PERCENTAGE AMOUNT OF ALKALI METAL SALT BEING CALCUALTED UPON THE QUANTITY OF ALKALI METAL ORHOPHOSPHATE PRESENT, AND RECOVERING ALKALI METAL POLYPHOSPHATES HAVING A BULK WEIGHT OF BETWEEN 250 AND ABOUT 600 GRAMS PER LITER.
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) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |