Patent US2977191A successfully refreshed from Google Patents.
US2977191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anhydrous colorless phosphates
Assignee: UCB SA
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Filing: 1958-03-14
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Granted: 1961-03-28
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Expires: 1978-03-14
Abstract
No abstract record available.
Inventors
- 👤 Pottiez Fernand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:05
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/30; C01B25/308; C01B25/301; C01B25/303
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A PROCESS FOR PREPARING ANHYDROUS COLORLESS ALKALI METAL PHOSPHATE, WHICH COMPRISES REACTING A SOLUTION OF CRUDE PHOSPHORIC ACID WHICH IS CONTAMINATED WITH IMPURITIES CONTAINING COLORED VANADIUM COMPOUNDS, IN THE PRESENCE OF A NEUTRALIZING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL CARBONATE AND ALKALI METAL HYDROXIDE, WITH A REDUCING AGENT HAVING A REDUCTION-OXIDATION POTENTIAL BELOW +0.5 VOLT AND BEING SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, SODIUM SULFITE, SODIUM SULFIDE AND FERROUS SULFATE, SO AS TO FORM AN INSOLUBLE VANADIUM-PHOSPHATES-CONTAINING PRODUCT IN SAID SOLUTION, SEPARATING THE INSOLUBLE PRODUCT FROM THE RESULTING LIQUID PHASE, AND DEHYDRATING THE LATTER TO OBTAIN ANHYDROUS COLORLESS ALKALI METAL PHOSPHATE.
Claim 2
Dependent Claim
105 words
A PROCESS FOR PREPARING ANHYDROUS COLORLESS ALKALI METAL PHOSPHATE, WHICH COMPRISES REACTING A SOLUTION OF CRUDE PHOSPHORIC ACID WHICH IS CONTAMINATED WITH IMPURITIES CONTAINING COLORED VANADIUM COMPOUNDS, IN THE PRESENCE OF A NEUTRALIZING AGENT SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL CARBONATE AND ALKALI METAL HYDROXIDE, WITH A REDUCING AGENT HAVING A REDUCTION-OXIDATION POTENTIAL BELOW +0.5 VOLT AND BEING SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, SODIUM SULFITE, SODIUM SULFIDE AND FERROUS SULFATE, SO AS TO FORM AN INSOLUBLE VANADIUM-PHOSPHATES-CONTAINING PRODUCT IN SAID SOLUTION, SEPARATING THE INSOLUBLE PRODUCT FROM THE RESULTING LIQUID PHASE, AND DEHYDRATING THE LATTER TO OBTAIN ANHYDROUS COLORLESS ALKALI METAL PHOSPHATE.
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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |