US2644806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a fertilizer containing water-insoluble nitrogen
Assignee: Honeywell International Inc
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Filing: 1950-09-14
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Granted: 1953-07-07
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Expires: 1970-09-14
Abstract
No abstract record available.
Inventors
- 👤 Mearl A Kise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:22
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN A PROCESS WHEREIN A SOLID UREA-FORMALDEHYDE REACTION PRODUCT IS PRECIPITATED FROM AN AQUEOUS SOLUTION OF UREA AND FROMALDEHYDE AND THE PRECIPITATED SOLID IS SEPARATED FROM MOTHER LIQUOR CONTAINING DISSOLVED UREA AND FORMALDEHYDE, THE IMPROVEMENT WHICH COMPRISES INHIBITING FURTHER PRECIPITATION OF SOLID FROM SAID MOTHER LIQUOR BY INCORPORATING THEREIN, IMMEDIATELY AFTER SEPARATION OF THE MOTHER LIQUOR FROM THE SOLID, UREA IN AMOUNT SUFFICIENT TO INCREASE THE RATIO OF UREA TO FORMALDEHYDE TO AT LEAST 6 MOLS UREA TO 1 MOL FORMALDEHYDE.
Claim 2
Dependent Claim
171 words
THE PROCESS FOR THE PRODUCTION OF A UREAFORMALDEHYDE REACTION PRODUCT CONTAINING INSOLUBLE NITROGEN AVAILABLE AS A PLANT FOOD WHICH COMPRISES REACTING UREA NAD FORMALDEHYDE IN AN ACIDIC AQUEOUS SOLUTION IN WHICH THE TOTAL CONCENTRATION OF THESE REACTIONS IS IN THE RANGE 15% TO 30% AND AN INSOLUBLE REACTION PRODUCT IS PRECIPITATED FROM THE SOLUTION UNDER THE FOLLOWING CONDITIONS: (1) INITIAL ACIDITY OF THE AQUEOUS SOLUTION IN THE RANGE PH 0.9 TO ABOUT 1.7; (2) MOL RATIO OF UREA TO FORMALDEHYDE IN THE RANGE 2.5:1 TO 4:1; (3) TEMPERATURE OF THE AQUEOUS SOLUTION IN THE RANGE 25* TO 45* C.; (4) REACTION TIME ABOUT 1/2 TO ABOUT 1 1/2 HOURS; AND (5) WHEN THE TEMPERATURES MAINTAINED ARE ABOVE 35* C. THE PH OF THE SOLUTION IS PROGRESSIVELY GREATER FROM 0.9 TO AT LEAST 1.3, THE UREA-FORMALDEHYDE MOL RATIO IS PROGRESSIVELY GREATER FROM 3:1 TO 4:1 AND THE MAXIMUM REACTION TIME IS PROGRESSIVELY SHORTER FROM 1 1/2 TO 1/2 HOUR AS HIGH REACTION TEMPERATURES ARE EMPLOYED UP TO A TEMPERATURE OF 45* C.
References Cited (Backward Citations)
DE528582C
Cited
US2415705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |