US3049419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Granular fertilisers
Assignee: Scottish Agricultural Industries Ltd
•
Filing: 1960-05-02
•
Granted: 1962-08-14
•
Expires: 1980-05-02
Abstract
No abstract record available.
Inventors
- 👤 Raistrick Bernard
- 👤 Raitt John Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:07
CPC Classifications
C; C05; C05B; C05B13/00; C05B13/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS OF MANUFACTURING, SUBSTANTIALLY WATER INSOLUBLE GRANULAR POTASSIUM METAPHOSPHATE CONSISTING ESSENTIALLY OF COMPLETELY REACTING A POTASSIUM SALT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM CHLORIDE AN POTASSIUM SULPHATE, WITH A PHOSPHORIC ACID AT A TEMPERATURE OF ABOVE 350* C. BUT BELOW THE FUSION POINT OF POTASSIUM METAPHOSPHATE, SAID REACTION BEING CARRIED OUT ON A MASS OF MOVING INERT PARTICLES UNABLE TO REACT WITH SAID REACTANTS TO ANY SUBSTANTIAL DEGREE AND SELECTED FROM THE GROUP CONSISTING OF POTASSIUM METAPHOSPHATE, POTASSIUM CHLORIDE AND POTASSIUM SULPHATE, AS TO PROVIDE A DRY LAYER OF POTASSIUM METAPHOSPHATE ON EACH OF SAID INERT PARTICLES THEREBY YIELDING THE DESIRED GRANULAR END PRODUCT.
Claim 2
Dependent Claim
106 words
A PROCESS OF MANUFACTURING, SUBSTANTIALLY WATER INSOLUBLE GRANULAR POTASSIUM METAPHOSPHATE CONSISTING ESSENTIALLY OF COMPLETELY REACTING A POTASSIUM SALT SELECTED FROM THE GROUP CONSISTING OF POTASSIUM CHLORIDE AN POTASSIUM SULPHATE, WITH A PHOSPHORIC ACID AT A TEMPERATURE OF ABOVE 350* C. BUT BELOW THE FUSION POINT OF POTASSIUM METAPHOSPHATE, SAID REACTION BEING CARRIED OUT ON A MASS OF MOVING INERT PARTICLES UNABLE TO REACT WITH SAID REACTANTS TO ANY SUBSTANTIAL DEGREE AND SELECTED FROM THE GROUP CONSISTING OF POTASSIUM METAPHOSPHATE, POTASSIUM CHLORIDE AND POTASSIUM SULPHATE, AS TO PROVIDE A DRY LAYER OF POTASSIUM METAPHOSPHATE ON EACH OF SAID INERT PARTICLES THEREBY YIELDING THE DESIRED GRANULAR END PRODUCT.
References Cited (Backward Citations)
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US2064979A
Cited
US2288418A
Cited
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Cited
US2926079A
Cited
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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) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |