Patent US3206282A successfully refreshed from Google Patents.
US3206282A
Expired / Lapsed
US
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Removal of soluble after-precipitate from concentrated phosphoric acid
Assignee: Honeywell International Inc
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Filing: 1962-02-20
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Granted: 1965-09-14
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Expires: 1982-02-20
Abstract
No abstract record available.
Inventors
- 👤 Robert J Crawford
- 👤 Sibek Rucgard
- 👤 Hebbel George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:59
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/235
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR THE PURIFICATION OF CONCENTRATED PHOSPHORIC ACID CONTAINING SOLUBLE AFTER-PRECIPITATE IMPURITIES WHICH COMPRISES DISPERSING SOLID AFTER-PRECIPITATE IN 60-85 PERCENT BY WEIGHT CONCENTRATED PHOSPHORIC ACID CONTAINING SOLUBLE AFTER-PRECIPITATE IMPURITIES IN AN AMOUNT OF AT LEAST ONE-HALF PERCENT SOLID AFTER-PRECIPITATE IMPURITIES BY WEIGHT OF THE CONCENTRATED PHOSPHORIC ACID, MAINTAINING SOLID AFTER-PRECIPITATE DISPERSED IN THE CONCENTRATED PHOSPHORIC ACID FOR AT LEAST 10 HOURS TO CONVERT IN EXCESS OF 60% BY WEIGHT OF THE SOLUBLE AFTER-PRECIPITATE IN THE PHOSPHORIC ACID TO AFTER-PRECIPITATE SOLIDS, MAINTAINING THE TEMPERATURE OF THE DISPERSION OF SOLID AFTER-PRECIPITATE IN CONCENTRATED PHOSPHORIC ACID DURING CONVERSION OF THE SOLUBLE FORM TO AFTER-PRECIPITATE SOLIDS WITHIN THE RANGE OF ABOUT 30-120*F., AND SEPARATING THE AFTER-PRECIPITATE SOLIDS FROM THE PURIFIED CONCENTRATED PHOSPHORIC ACID.
Claim 2
Dependent Claim
120 words
A PROCESS FOR THE PURIFICATION OF CONCENTRATED PHOSPHORIC ACID CONTAINING SOLUBLE AFTER-PRECIPITATE IMPURITIES WHICH COMPRISES DISPERSING SOLID AFTER-PRECIPITATE IN 60-85 PERCENT BY WEIGHT CONCENTRATED PHOSPHORIC ACID CONTAINING SOLUBLE AFTER-PRECIPITATE IMPURITIES IN AN AMOUNT OF AT LEAST ONE-HALF PERCENT SOLID AFTER-PRECIPITATE IMPURITIES BY WEIGHT OF THE CONCENTRATED PHOSPHORIC ACID, MAINTAINING SOLID AFTER-PRECIPITATE DISPERSED IN THE CONCENTRATED PHOSPHORIC ACID FOR AT LEAST 10 HOURS TO CONVERT IN EXCESS OF 60% BY WEIGHT OF THE SOLUBLE AFTER-PRECIPITATE IN THE PHOSPHORIC ACID TO AFTER-PRECIPITATE SOLIDS, MAINTAINING THE TEMPERATURE OF THE DISPERSION OF SOLID AFTER-PRECIPITATE IN CONCENTRATED PHOSPHORIC ACID DURING CONVERSION OF THE SOLUBLE FORM TO AFTER-PRECIPITATE SOLIDS WITHIN THE RANGE OF ABOUT 30-120*F., AND SEPARATING THE AFTER-PRECIPITATE SOLIDS FROM THE PURIFIED CONCENTRATED PHOSPHORIC ACID.
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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |