Patent US2844455A successfully refreshed from Google Patents.
US2844455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fertilizer manufacture
Assignee: Monsanto Chemicals Ltd
•
Filing: 1953-09-25
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Granted: 1958-07-22
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Expires: 1973-09-25
Abstract
No abstract record available.
Inventors
- 👤 Jay C Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:10
CPC Classifications
C; C05; C05B; C05B1/00; C05B1/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
IN THE PROCESS OF PRODUCTING SUPERPHOSPHATE FERTILIZERS BY THE ACIDULATION OF NATURAL PHOSPHATES, THE IMPROVEMENT COMPRISING CARRYING OUT SAID ACIDULATION WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID AND PHOSPHORIC ACID IN THE PRESENCE OF AN ALKALI METAL ALKYLBENZENE SULFONATE HAVING FROM 4 TO 6 CARBON ATOMS IN THE ALKYL PORTION THEREOF.
Claim 2
Dependent Claim
55 words
IN THE PROCESS OF PRODUCTING SUPERPHOSPHATE FERTILIZERS BY THE ACIDULATION OF NATURAL PHOSPHATES, THE IMPROVEMENT COMPRISING CARRYING OUT SAID ACIDULATION WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID AND PHOSPHORIC ACID IN THE PRESENCE OF AN ALKALI METAL ALKYLBENZENE SULFONATE HAVING FROM 4 TO 6 CARBON ATOMS IN THE ALKYL PORTION THEREOF.
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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) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |