Patent US3220824A successfully refreshed from Google Patents.
US3220824A
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Process for making a mixed fertilizer containing urea-formaldehyde polymer
Assignee: EIDP Inc
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Filing: 1963-07-24
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Granted: 1965-11-30
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Expires: 1983-07-24
Abstract
No abstract record available.
Inventors
- 👤 Robert J Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:45
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A PROCESS FOR MAKING A MIXED FERTILIZER CONTAINING UREA-FORMALDEHYDE POLYMER HAVING AN ACTIVITY INDEX IN EXCESS OF 40, SAID PROCESS COMPRISING PREMIXING IN A CLOSED CONTAINER A FERTILIZER AMMONIATING SOLUTION CONTAINING UREA AND A SOURCE OF FORMALDEHYDE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID IN AN AMOUNT SUFFICIENT TO PRODUCE A MIXTURE HAVING A PH VALUE IN THE RANGE OF 6.8 TO 11 AND PHOSPHORIC ACID IN AN AMOUNT SUFFICIENT TO PRODUCE A MIXTURE HAVING A PH VALUE IN THE RANGE OF 6 TO 6.5, AND SUBSEQUENTLY ADDING SAID PREMIXED SOLUTION TO DRY FERTILIZER INGREDIENTS TO PRODUCE A MIXTURE HAVING A PH VALUE IN THE RANGE 5.2 TO 6.2, SAID DRY FERTILIZER INGREDIENTS HAVING INCLUDED THEREIN A PREFORMED SOLID UREA-FORMALDEHYDE POLYMER PRIOR TO THE ADDITION OF SAID PREMIXED SOLUTION.
Claim 2
Dependent Claim
133 words
A PROCESS FOR MAKING A MIXED FERTILIZER CONTAINING UREA-FORMALDEHYDE POLYMER HAVING AN ACTIVITY INDEX IN EXCESS OF 40, SAID PROCESS COMPRISING PREMIXING IN A CLOSED CONTAINER A FERTILIZER AMMONIATING SOLUTION CONTAINING UREA AND A SOURCE OF FORMALDEHYDE WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID IN AN AMOUNT SUFFICIENT TO PRODUCE A MIXTURE HAVING A PH VALUE IN THE RANGE OF 6.8 TO 11 AND PHOSPHORIC ACID IN AN AMOUNT SUFFICIENT TO PRODUCE A MIXTURE HAVING A PH VALUE IN THE RANGE OF 6 TO 6.5, AND SUBSEQUENTLY ADDING SAID PREMIXED SOLUTION TO DRY FERTILIZER INGREDIENTS TO PRODUCE A MIXTURE HAVING A PH VALUE IN THE RANGE 5.2 TO 6.2, SAID DRY FERTILIZER INGREDIENTS HAVING INCLUDED THEREIN A PREFORMED SOLID UREA-FORMALDEHYDE POLYMER PRIOR TO THE ADDITION OF SAID PREMIXED SOLUTION.
References Cited (Backward Citations)
US1893437A
Cited
US2255026A
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US2502996A
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US2592809A
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US2618546A
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US2644806A
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US2766283A
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US2955930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |