US2916371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature control process for making urea formaldehyde fertilizer compositions
Assignee: Individual
•
Filing: 1956-10-26
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Granted: 1959-12-08
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Expires: 1976-10-26
Abstract
No abstract record available.
Inventors
- 👤 James M O'donnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:16
CPC Classifications
C; C05; C05C; C05C9/00; C05C9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A METHOD FOR THE PRODUCTIONOF SOLID UREA-FORM FERTILIZER COMPOSITIONS FROM AN ALKALINE LIQUID MIX OF UREAFORMALDEHYDE WHEREIN THE MOL RATIO OF UREA:FORMALDEHYDR IS $1 WHICH COMPRISES ACIDIFYING SAID MIX TO A PH VALUE OF FROM ABOUT 2.0 TO 4.0 TO CATALYZE POLYMERIZATION AND IMMEDIATELY INTRODUCING SAID ACIDIFIED LIQUID MIX ONTO A CONTINOUS ELONGATED MOVING SURFACE TO PROMOTE THE FORMATION OF A UREA-FORMALDEHYDE POLYMER LAYER NOT GREATED THAN ABOUT ONE-HALF INCH THICKNESS, MAINTAINING THE TEMPERATURE OF SAID POLYMER LAYER BETWEEN 40* AND 58*C. ON SAID SURFACE DURING REACTON, REMOVING SAID LAYER FROM SAID MOVING SURFACE, NEUTRALIZING SAID REMOVED LAYER, AND DRYING SAID NEUTRALIZED LAYER.
Claim 2
Independent Claim
103 words
A METHOD FOR THE PRODUCTIONOF SOLID UREA-FORM FERTILIZER COMPOSITIONS FROM AN ALKALINE LIQUID MIX OF UREAFORMALDEHYDE WHEREIN THE MOL RATIO OF UREA:FORMALDEHYDR IS $1 WHICH COMPRISES ACIDIFYING SAID MIX TO A PH VALUE OF FROM ABOUT 2.0 TO 4.0 TO CATALYZE POLYMERIZATION AND IMMEDIATELY INTRODUCING SAID ACIDIFIED LIQUID MIX ONTO A CONTINOUS ELONGATED MOVING SURFACE TO PROMOTE THE FORMATION OF A UREA-FORMALDEHYDE POLYMER LAYER NOT GREATED THAN ABOUT ONE-HALF INCH THICKNESS, MAINTAINING THE TEMPERATURE OF SAID POLYMER LAYER BETWEEN 40* AND 58*C. ON SAID SURFACE DURING REACTON, REMOVING SAID LAYER FROM SAID MOVING SURFACE, NEUTRALIZING SAID REMOVED LAYER, AND DRYING SAID NEUTRALIZED LAYER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-07 | 1963-06-08 | 1963-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-07 | 1967-06-08 | 1967-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-07 | 1971-06-08 | 1971-12-08 | $7700.00 | Window Closed / Lapsed |