Patent US2830036A successfully refreshed from Google Patents.
US2830036A
Expired / Lapsed
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Production of fertilizer compositions
Assignee: Nitro-Form Agricultural Chemical Co
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Filing: 1955-06-06
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Granted: 1958-04-08
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Expires: 1975-06-06
Abstract
No abstract record available.
Inventors
- 👤 James M O'donnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:56
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN A METHOD FOR PREPARING UREA-FORM FERTILIZER COMPOSITIONS FROM AN ACIDIFIED AQUEOUS LIQUID MIX PRODUCED UNDER ALKALINE CONDITIONS AT A TEMPERATURE NOT EXCEEDING ABOUT 60*C. AND CONTAINING 1.2 TO 1.5 MOLECULAR EQUIVALENTS OF UREA PER MOLUCULAR EQUIVALENT OF FORMALDEHYDE, THE STEPS COMPRISING INTERDUCING THE ACIDIFIED AQUEOUS LIQUID MIX ONTO A HORIZONTAL ELONGATED MOVING SURFACE TO FORM A POLYMER LAYER AND SUBJECTING SAID LAYER TO A STAGE WISE TEMPERATURE CONTROL PROCESS COMPRISING (A) INITIATING REACTION BY HEATING AT AN APPLIED TEMPERATURE OF ABOUT 60*C. TO 100*C., (B) QUICK COOLING TO PRODUCE A LAYER TEMPERATURE OF ABOUT 40*C. TO 50*C., (C) NEUTRALIZING SAID LAYER, AND (D) DRYING AT AN APPLIED TEMPERATURE OF ABOUT 120*C.
Claim 2
Dependent Claim
112 words
IN A METHOD FOR PREPARING UREA-FORM FERTILIZER COMPOSITIONS FROM AN ACIDIFIED AQUEOUS LIQUID MIX PRODUCED UNDER ALKALINE CONDITIONS AT A TEMPERATURE NOT EXCEEDING ABOUT 60*C. AND CONTAINING 1.2 TO 1.5 MOLECULAR EQUIVALENTS OF UREA PER MOLUCULAR EQUIVALENT OF FORMALDEHYDE, THE STEPS COMPRISING INTERDUCING THE ACIDIFIED AQUEOUS LIQUID MIX ONTO A HORIZONTAL ELONGATED MOVING SURFACE TO FORM A POLYMER LAYER AND SUBJECTING SAID LAYER TO A STAGE WISE TEMPERATURE CONTROL PROCESS COMPRISING (A) INITIATING REACTION BY HEATING AT AN APPLIED TEMPERATURE OF ABOUT 60*C. TO 100*C., (B) QUICK COOLING TO PRODUCE A LAYER TEMPERATURE OF ABOUT 40*C. TO 50*C., (C) NEUTRALIZING SAID LAYER, AND (D) DRYING AT AN APPLIED TEMPERATURE OF ABOUT 120*C.
References Cited (Backward Citations)
US2456192A
Cited
US2592809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |