US2592809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of nitrogenous fertilizer compositions
Assignee: EIDP Inc
•
Filing: 1949-01-27
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Granted: 1952-04-15
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Expires: 1969-01-27
Abstract
No abstract record available.
Inventors
- 👤 Robert D Kralovec
- 👤 Robert L Huffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:49
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; C05; C05C; C05C9/00; C05C9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A METHOD FOR PREPARING A SOLID UREA-FORMALDEHYDE FERTILIZER COMPOSITION WHICH COMPRISES CONTINUOUSLY INTRODUCING A LIQUID AQUEOUS COMPOSITION CONTAINING FROM 1.3 TO 1.6 MOLECULAR EQUIVALENTS OF UREA PER MOLECULAR EQUIVALENT OF FORMALDEHYDE ONTO A MOVING SURFACE IN AN AMOUNT SUFFICIENT TO FORM A THIN LAYER ON SAID SURFACE OF FROM 1/32 INCH TO 1/4 INCH IN THICKNESS, SUBJECTING THE UREA-FORMALDEHYDE COMPOSITON TO REACTION THEREON AT A TEMPERATURE OF FROM 60* TO 120* C. AND AT A PH OF FROM 2 TO 6 UNTIL SOLIDIFICATION OF THE COMPOSITION OCCURS, AND THEREAFTER CONTINUOUSLY REMOVING THE SOLIDIFIED PRODUCT FROM SAID SURFACE.
Claim 2
Independent Claim
97 words
A METHOD FOR PREPARING A SOLID UREA-FORMALDEHYDE FERTILIZER COMPOSITION WHICH COMPRISES CONTINUOUSLY INTRODUCING A LIQUID AQUEOUS COMPOSITION CONTAINING FROM 1.3 TO 1.6 MOLECULAR EQUIVALENTS OF UREA PER MOLECULAR EQUIVALENT OF FORMALDEHYDE ONTO A MOVING SURFACE IN AN AMOUNT SUFFICIENT TO FORM A THIN LAYER ON SAID SURFACE OF FROM 1/32 INCH TO 1/4 INCH IN THICKNESS, SUBJECTING THE UREA-FORMALDEHYDE COMPOSITON TO REACTION THEREON AT A TEMPERATURE OF FROM 60* TO 120* C. AND AT A PH OF FROM 2 TO 6 UNTIL SOLIDIFICATION OF THE COMPOSITION OCCURS, AND THEREAFTER CONTINUOUSLY REMOVING THE SOLIDIFIED PRODUCT FROM SAID SURFACE.
References Cited (Backward Citations)
CA419422A
Cited
US1929624A
Cited
US2034599A
Cited
US2118439A
Cited
US2345013A
Cited
US2415705A
Cited
US2456192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |