Patent US3170761A successfully refreshed from Google Patents.
US3170761A
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Process for the production of phosphoric acid and apparatus therefor
Assignee: FISOUS FERTILIZERS Ltd
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Filing: 1961-11-13
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Granted: 1965-02-23
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Expires: 1981-11-13
Abstract
No abstract record available.
Inventors
- 👤 Janikowski Stanislaw Maria
- 👤 Sheldrick William Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:26
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22; B; B01; B01J; B01J19/00; B01J19/0053; B01J19/0066; B01J19/18; B01J19/1862; C05; C05B; C05B11/00; C05B11/04; C05B11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A CONTINUOUS PROCESS FOR THE MANUFACTURE OF PHOSPHORIC ACID BY THE WET PROCESS FROM SULPHURIC ACID AND PHOSPHATE ROCK WHICH COMPRISES THE STEPS OF ADDING PHOSPHATE ROCK TO THE FIRST ZONE OF AT LEAST THREE ZONES COMMUNICATING IN SERIES, AT LEAST TWO OF SAID ZONES COMMUNICATING WITH A DRAFT TUBE PROVIDED WITH IMPELLER MEANS, ADDING SULPHURIC ACID TO A DIFFERENT ZONE IN THE SERIES, CIRCULATING THE REACTION MIXTURE WITH AGITATION THROUGH SAID ZONES, RECIRCULATING PART OF THE REACTION MIXTURE FROM THE LAST ZONE TO THE FIRST ZONE IN THE SSERIES THROUGH SAID DRAFT TUBE, WITHDRAWING PART OF THE REACTION MIXTURE FROM THE LAST ZONE IN THE SERIES, THE HOLDING TIME IN THE FIRST ZONE BEING GREATER THAN THE HOLDING TIME IN THE SUBSEQUENT ZONES.
Claim 2
Dependent Claim
124 words
A CONTINUOUS PROCESS FOR THE MANUFACTURE OF PHOSPHORIC ACID BY THE WET PROCESS FROM SULPHURIC ACID AND PHOSPHATE ROCK WHICH COMPRISES THE STEPS OF ADDING PHOSPHATE ROCK TO THE FIRST ZONE OF AT LEAST THREE ZONES COMMUNICATING IN SERIES, AT LEAST TWO OF SAID ZONES COMMUNICATING WITH A DRAFT TUBE PROVIDED WITH IMPELLER MEANS, ADDING SULPHURIC ACID TO A DIFFERENT ZONE IN THE SERIES, CIRCULATING THE REACTION MIXTURE WITH AGITATION THROUGH SAID ZONES, RECIRCULATING PART OF THE REACTION MIXTURE FROM THE LAST ZONE TO THE FIRST ZONE IN THE SSERIES THROUGH SAID DRAFT TUBE, WITHDRAWING PART OF THE REACTION MIXTURE FROM THE LAST ZONE IN THE SERIES, THE HOLDING TIME IN THE FIRST ZONE BEING GREATER THAN THE HOLDING TIME IN THE SUBSEQUENT ZONES.
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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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |