Patent US2917367A successfully refreshed from Google Patents.
US2917367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purifying crude phosphoric acid
Assignee: JBS USA LLC
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Filing: 1957-01-22
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Granted: 1959-12-15
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Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 William A Hodges
- 👤 Joseph E Floyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:06
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/2343
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD OF TREATING CURDE DILUTE PHOSPHORIC ACID PRODUCED BY ACIDULATING PHOSPHATE ROCK WHEREBY TO PRODUCE A CONCENTRATED ACID COMPRISING: TREATING CRUDE DILUTE PHOSPHORIC ACID SO FORMED TO REMOVE THE BULK OF THE FLOURIDE IONS FROM SAID CURDE DILUTE ACID; SEPARATING SAID FLUORIDE IONS FROM SAID CRUDE DILUTE ACID; CONCENTRATING SAID CRUDE DILUTE ACID AT AN ELEVATED TEMPERATURE AT AN ABSOLUTE PRESSURE OF BETWEEN ABOUT 7" ASND 25" HG WHEREBY TO PRODUCE A FILTERABLE SLURRY CONTAINING CONCENTRATED PHOSPHORIC ACID AND FILTERING SAID SLURRY WHEREBY TO OBTAIN PURIFIED CONCENTRATED PHOSPHORIC ACID.
Claim 2
Independent Claim
90 words
A METHOD OF TREATING CURDE DILUTE PHOSPHORIC ACID PRODUCED BY ACIDULATING PHOSPHATE ROCK WHEREBY TO PRODUCE A CONCENTRATED ACID COMPRISING: TREATING CRUDE DILUTE PHOSPHORIC ACID SO FORMED TO REMOVE THE BULK OF THE FLOURIDE IONS FROM SAID CURDE DILUTE ACID; SEPARATING SAID FLUORIDE IONS FROM SAID CRUDE DILUTE ACID; CONCENTRATING SAID CRUDE DILUTE ACID AT AN ELEVATED TEMPERATURE AT AN ABSOLUTE PRESSURE OF BETWEEN ABOUT 7" ASND 25" HG WHEREBY TO PRODUCE A FILTERABLE SLURRY CONTAINING CONCENTRATED PHOSPHORIC ACID AND FILTERING SAID SLURRY WHEREBY TO OBTAIN PURIFIED CONCENTRATED PHOSPHORIC ACID.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-14 | 1963-06-15 | 1963-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-14 | 1967-06-15 | 1967-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-14 | 1971-06-15 | 1971-12-15 | $7700.00 | Window Closed / Lapsed |