Patent US3333929A successfully refreshed from Google Patents.
US3333929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clarification and concentration of wet process phosphoric acid
Assignee: Armour Agricultural Chemical Co
•
Filing: 1966-04-04
•
Granted: 1967-08-01
•
Expires: 1986-04-04
Abstract
No abstract record available.
Inventors
- 👤 Robert C Mazurek
- 👤 Joseph S Mcclure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:33
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/18; C01B25/234; C01B25/235; Y; Y10; Y10S; Y10S159/00; Y10S159/19; Y10S159/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A PROCESS FOR CLARIFYING AND CONCENTRATING WET PROCESS PHOSPHORIC ACID CONTAINING IRON PHOSPHATE AND OTHER SOLIDS AND IN WHICH THE ACID IS CONCENTRATED BY HEAT EVAPORATION, THE CONCENTRATED ACID BEING COOLED AND CENTRIFUGED TO REMOVE CRYSTALS, CHARACTERIZED IN THAT A PORTION OF THE CENTRIFUGED ACID CONTAINING SOLIDS OF LESS THAN 10 MICRONS IN AVERAGE SIZE IS WITHDRAWN AS PRODUCT AND A FRACTION CONTAINING SOLIDS OF 10 MICRONS SIZE AND LARGER IS RECYCLED AND MIXED WITH THE ACID BEING FED TO THE EVAPORATOR, SAID RECYCLED ACID CONTAINING IRON PHOSPHATES IN AN AMOUNT SUFFICIENT TO BRING THE IRON PHOSPHATE CONTENT OF THE CONCENTRATED ACID INTO THE RANGE OF ABOUT 3.4-6.0%.
Claim 2
Dependent Claim
108 words
A PROCESS FOR CLARIFYING AND CONCENTRATING WET PROCESS PHOSPHORIC ACID CONTAINING IRON PHOSPHATE AND OTHER SOLIDS AND IN WHICH THE ACID IS CONCENTRATED BY HEAT EVAPORATION, THE CONCENTRATED ACID BEING COOLED AND CENTRIFUGED TO REMOVE CRYSTALS, CHARACTERIZED IN THAT A PORTION OF THE CENTRIFUGED ACID CONTAINING SOLIDS OF LESS THAN 10 MICRONS IN AVERAGE SIZE IS WITHDRAWN AS PRODUCT AND A FRACTION CONTAINING SOLIDS OF 10 MICRONS SIZE AND LARGER IS RECYCLED AND MIXED WITH THE ACID BEING FED TO THE EVAPORATOR, SAID RECYCLED ACID CONTAINING IRON PHOSPHATES IN AN AMOUNT SUFFICIENT TO BRING THE IRON PHOSPHATE CONTENT OF THE CONCENTRATED ACID INTO THE RANGE OF ABOUT 3.4-6.0%.
References Cited (Backward Citations)
US2347073A
Cited
US2608465A
Cited
US2602023A
Cited
FR1135905A
Cited
US2888449A
Cited
US3216481A
Cited
FR1364200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |