US2640757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ammonium sulfate and calcium carbonate
Assignee: Phillips Petroleum Co
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Filing: 1949-09-23
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Granted: 1953-06-02
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Expires: 1969-09-23
Abstract
No abstract record available.
Inventors
- 👤 Sam P Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:31
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/24; C01C1/244
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A PROCESS FOR THE MANUFACTURE OF AMMONIUM SULFATE AND CALCIUM CARBONATE WHICH COMPRISES REACTING AN AQUEOUS SLURRY OF CALCIUM SULFATE AND AN AQUEOUS SOLUTION OF AMMONIUM CARBONATE IN A PLURALITY OF REACTION ZONES IN THE PRESENCE OF A MINOR QUANTITY OF AMMONIUM BICARBONATE, SAID REACTION ZONES BEING OF PROGRESSIVELY LARGER SIZE AND OF DECREASING AGITATION, PASSING THE REACTANTS AND SUFFICIENT AMMONIUM BICARBONATE TO MAINTAIN THE PH BETWEEN 6 AND 8 TO THE FIRST OF SAID REACTION ZONES, PASSING THE EFFLUENT FROM SAID FIRST REACTION ZONE TO SUBSEQUENT REACTION ZONES WHERE SUFFICIENT AMMONIA IS ADDED TO REACT WITH THE AMMONIUM BICARBONATE AND INCREASE THE PH FROM THAT IN THE FIRST ZONE UP TO 9 TO 10 IN THE LAST ZONE, MAINTAINING A PROGRESSIVELY INCREASING RESIDENCE TIME IN THE
Claim 2
Dependent Claim
127 words
A PROCESS FOR THE MANUFACTURE OF AMMONIUM SULFATE AND CALCIUM CARBONATE WHICH COMPRISES REACTING AN AQUEOUS SLURRY OF CALCIUM SULFATE AND AN AQUEOUS SOLUTION OF AMMONIUM CARBONATE IN A PLURALITY OF REACTION ZONES IN THE PRESENCE OF A MINOR QUANTITY OF AMMONIUM BICARBONATE, SAID REACTION ZONES BEING OF PROGRESSIVELY LARGER SIZE AND OF DECREASING AGITATION, PASSING THE REACTANTS AND SUFFICIENT AMMONIUM BICARBONATE TO MAINTAIN THE PH BETWEEN 6 AND 8 TO THE FIRST OF SAID REACTION ZONES, PASSING THE EFFLUENT FROM SAID FIRST REACTION ZONE TO SUBSEQUENT REACTION ZONES WHERE SUFFICIENT AMMONIA IS ADDED TO REACT WITH THE AMMONIUM BICARBONATE AND INCREASE THE PH FROM THAT IN THE FIRST ZONE UP TO 9 TO 10 IN THE LAST ZONE, MAINTAINING A PROGRESSIVELY INCREASING RESIDENCE TIME IN THE
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) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |