US3147174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low moisture urea melt
Assignee: Chemical Construction Corp
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Filing: 1959-10-14
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Granted: 1964-09-01
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Expires: 1979-10-14
Abstract
No abstract record available.
Inventors
- 👤 Lucien H Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:34
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02; C07C273/14; C07C273/16; C05; C05C; C05C9/00; C05C9/005; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
PROCESS FOR PRODUCING A UREA MELT CONTAINING AT LEAST 99.5% UREA WHICH COMPRISES CONTACTING A CONCENTRATED UREA SOLUTION CONTAINING ABOUT 2.5% TO 3% WATER WITH A STREAM OF PREHEATED GAS AT A TEMPERATURE IN THE RANGE OF 280*F. TO 300*F., AND MAINTAINING THE TOTAL GAS PHASE PRESSURE BETWEEN ABOUT 180 TO 300 MM. HG ABSOLUTE, WHEREBY WATER IS VAPORIZED FROM SAID UREA SOLUTION INTO SAID STREAM OF PREHEATED GAS WITHOUT FORMATION OF A SOLID UREA PHASE.
Claim 2
Dependent Claim
76 words
PROCESS FOR PRODUCING A UREA MELT CONTAINING AT LEAST 99.5% UREA WHICH COMPRISES CONTACTING A CONCENTRATED UREA SOLUTION CONTAINING ABOUT 2.5% TO 3% WATER WITH A STREAM OF PREHEATED GAS AT A TEMPERATURE IN THE RANGE OF 280*F. TO 300*F., AND MAINTAINING THE TOTAL GAS PHASE PRESSURE BETWEEN ABOUT 180 TO 300 MM. HG ABSOLUTE, WHEREBY WATER IS VAPORIZED FROM SAID UREA SOLUTION INTO SAID STREAM OF PREHEATED GAS WITHOUT FORMATION OF A SOLID UREA PHASE.
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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |