Patent US3181931A successfully refreshed from Google Patents.
US3181931A
Expired / Lapsed
US
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Process for producing phosphoric acid
Assignee: Dorr Oliver Inc
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Filing: 1962-02-19
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Granted: 1965-05-04
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 William C Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:42
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/22; B; B01; B01J; B01J16/00; B01J19/00; B01J19/18; B01J19/1862; C05; C05B; C05B11/00; C05B11/04; C05B11/06; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00121; B01J2219/00164; B01J2219/00189
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
PROCESS FOR CONTINUOUSLY PRODUCING PHOSPHORIC ACID BY REACTING PHOSPHATE ROCK WITH SULFURIC ACID COMPRISING THE STEPS OF, ESTABLISHING A CONFINED SUBSTANTIALLY UNOBSTRUCTED CYCLIC STREAM OF A REACTION SLURRY OBTAINED BY ACIDULATING PHOSPHATE ROCK WITH ACID, ESTABLISHING ALONG SAID CYCLIC STREAM A PLURALITY OF SUCCESSIVE CONTINUOUS REACTION ZONES COMPRISING AT LEAST A FEED ZONE WHEREIN PHOSPHATE ROCK AND ACIDULATING ACID IS INTRODUCED INTO SAID STREAM, AN INTERMEDIATE REACTION ZONE, WHEREIN THE REACTION BETWEEN SAID ROCK AND SAID ACID INITIATED IN SAID FEED ZONE IS PERMITTED TO CONTINUE, AND A DISCHARGE ZONE WHEREIN REACTION SLURRY IS DISCHARGED FROM SAID STREAM, SAID DISCHARGE ZONE BEING PREFERABLY ADJACENT SAID FEED
Claim 2
Dependent Claim
106 words
PROCESS FOR CONTINUOUSLY PRODUCING PHOSPHORIC ACID BY REACTING PHOSPHATE ROCK WITH SULFURIC ACID COMPRISING THE STEPS OF, ESTABLISHING A CONFINED SUBSTANTIALLY UNOBSTRUCTED CYCLIC STREAM OF A REACTION SLURRY OBTAINED BY ACIDULATING PHOSPHATE ROCK WITH ACID, ESTABLISHING ALONG SAID CYCLIC STREAM A PLURALITY OF SUCCESSIVE CONTINUOUS REACTION ZONES COMPRISING AT LEAST A FEED ZONE WHEREIN PHOSPHATE ROCK AND ACIDULATING ACID IS INTRODUCED INTO SAID STREAM, AN INTERMEDIATE REACTION ZONE, WHEREIN THE REACTION BETWEEN SAID ROCK AND SAID ACID INITIATED IN SAID FEED ZONE IS PERMITTED TO CONTINUE, AND A DISCHARGE ZONE WHEREIN REACTION SLURRY IS DISCHARGED FROM SAID STREAM, SAID DISCHARGE ZONE BEING PREFERABLY ADJACENT SAID FEED
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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) | 1968-05-03 | 1968-11-02 | 1969-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-03 | 1972-11-02 | 1973-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-03 | 1976-11-02 | 1977-05-04 | $7700.00 | Window Closed / Lapsed |