US3077381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphoric acid
Assignee: Union Oil Company of California
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Filing: 1959-11-02
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Granted: 1963-02-12
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Expires: 1979-11-02
Abstract
No abstract record available.
Inventors
- 👤 Bergsteinsson Ingolfur
- 👤 Irving D Webb
- 👤 Backlund Peter Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:15
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A LOW FREEZING POINT CONCENTRATED PHOSPHORIC ACID WHICH HAS: A FREEZING POINT LESS THAN ABOUT 40*F.; A PHOSPHROUS CONTENT EXPRESSED AS P2O5 ON AN IMPURITY-FREE BASIS BETWEEN ABOUT 67 AND ABOUT 74 WEIGHT PERCENT; A NITROGEN CONTENT BETWEEN ABOUT 0.4 AND ABOUT 2.5 WEIGHT PERCENT; SAID LOW FREEZING POINT CONCENTRATED PHOSPHORIC ACID BEING OBTAINED FROM A CONCENTRATED PHOSPHORIC ACID HAVING A FREEZING POINT IN AXCESS OF 40*F. BY THE ADDITION THERETO OF A MATERIAL SELECTED FROM THE CLASS CONSISTING OF AMMONIA, MONOAMMONIUM PHOSPHATE, DIAMMONIUM PHOSPHATE, AMMONIUM SULFATE, AMMONIUM NITRATE, AMMONIUM CARBONATE, AMMONIUM CHLORIDE, AMMONIUM ACETATE, AMMONIUM BROMIDE, AMMONIUM SILICATE, AMMONIUM LACTATE, AMMONIUM CITRATE, AMMONIUM GLUCONATE, AND MIXTURE THEREOF; AND BY RECOVERY AS A PRODUCT SAID LOW FREEZING POINT CONCENTRATED PHOSPHORIC ACID HAVING SAID PHOSPHROUS CONTENT AND MITROGEN CONTENT.
Claim 2
Dependent Claim
128 words
A LOW FREEZING POINT CONCENTRATED PHOSPHORIC ACID WHICH HAS: A FREEZING POINT LESS THAN ABOUT 40*F.; A PHOSPHROUS CONTENT EXPRESSED AS P2O5 ON AN IMPURITY-FREE BASIS BETWEEN ABOUT 67 AND ABOUT 74 WEIGHT PERCENT; A NITROGEN CONTENT BETWEEN ABOUT 0.4 AND ABOUT 2.5 WEIGHT PERCENT; SAID LOW FREEZING POINT CONCENTRATED PHOSPHORIC ACID BEING OBTAINED FROM A CONCENTRATED PHOSPHORIC ACID HAVING A FREEZING POINT IN AXCESS OF 40*F. BY THE ADDITION THERETO OF A MATERIAL SELECTED FROM THE CLASS CONSISTING OF AMMONIA, MONOAMMONIUM PHOSPHATE, DIAMMONIUM PHOSPHATE, AMMONIUM SULFATE, AMMONIUM NITRATE, AMMONIUM CARBONATE, AMMONIUM CHLORIDE, AMMONIUM ACETATE, AMMONIUM BROMIDE, AMMONIUM SILICATE, AMMONIUM LACTATE, AMMONIUM CITRATE, AMMONIUM GLUCONATE, AND MIXTURE THEREOF; AND BY RECOVERY AS A PRODUCT SAID LOW FREEZING POINT CONCENTRATED PHOSPHORIC ACID HAVING SAID PHOSPHROUS CONTENT AND MITROGEN CONTENT.
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) | 1966-02-11 | 1966-08-13 | 1967-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-11 | 1970-08-13 | 1971-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-11 | 1974-08-13 | 1975-02-12 | $7700.00 | Window Closed / Lapsed |