Patent US2681302A successfully refreshed from Google Patents.
US2681302A
Expired / Lapsed
US
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Separ
Assignee: —
•
Filing: —
•
Granted: 1954-06-15
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Expires: 1971-06-15
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:14
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/24; C07; C07C; C07C275/00; C07C275/02; C07C319/00; C07C319/26; C07C319/28; C07C335/00; C07C335/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
THE PROCESS FOR SEPARATING A COMPOUND (1) HAVING THE CAPACITY OT FROM A CRYSTALLINE COMPLEX WITH A COMPLEX-FORMING AGENT SELECTED FROM THE GROUP CONSISTING OF UREA AND THIOUREA, FROM A MIXTURE CONTAINING SAID COMPOUND (1) AND A COMPOUND (11) INCAPABLE OF FORMING A CRYSTALLINE COMPLEX WITH THE SAME SAID AGENT, WHICH COMPRISES: INTRODUCING INTO AN UPPER SECTION OF A TOWER A HIGHLY SATURATED SOLUTION OF SAID COMPLEX-FORMING AGENT, SAID SOLUTION FLOWING DOWNWARDLY THROUGH THE TOWER; INTRODUCING SAID MIXTURE INTO A CENTRAL SECTION OF THE TOWER, THE MIXTURE BEING MAINTAINED AT A LOWER TEMPERATURE THAN SAID SOLUTION AND AT WHICH TEMPERATURE SAID SOLUTION IS SUPERSATURATED WITH SAID AGENT, THE SAID MIXTURE BEING IN CONTACT WITH THE DOWNWARDLY FLOWING SOLUTION IN A CENTRAL SECTION OF THE TOWER, WHEREBY RIGID GLOBULES OF SAID AGENT ARE FORMED; RETAINING SAID RIGID GLOBULES IN SAID MIXTURE UNTIL COMPLEX FORMATION OCCURS WITH THE FORMATION OF A COMPLEX OF SAID AGENT AND SAID COMPOUND (I) IN GENERALLY SPHEROIDAL FORM, IN CENTRAL SECTION OF SAID TOWER; THERMALLY DECOM-
Claim 2
Dependent Claim
169 words
THE PROCESS FOR SEPARATING A COMPOUND (1) HAVING THE CAPACITY OT FROM A CRYSTALLINE COMPLEX WITH A COMPLEX-FORMING AGENT SELECTED FROM THE GROUP CONSISTING OF UREA AND THIOUREA, FROM A MIXTURE CONTAINING SAID COMPOUND (1) AND A COMPOUND (11) INCAPABLE OF FORMING A CRYSTALLINE COMPLEX WITH THE SAME SAID AGENT, WHICH COMPRISES: INTRODUCING INTO AN UPPER SECTION OF A TOWER A HIGHLY SATURATED SOLUTION OF SAID COMPLEX-FORMING AGENT, SAID SOLUTION FLOWING DOWNWARDLY THROUGH THE TOWER; INTRODUCING SAID MIXTURE INTO A CENTRAL SECTION OF THE TOWER, THE MIXTURE BEING MAINTAINED AT A LOWER TEMPERATURE THAN SAID SOLUTION AND AT WHICH TEMPERATURE SAID SOLUTION IS SUPERSATURATED WITH SAID AGENT, THE SAID MIXTURE BEING IN CONTACT WITH THE DOWNWARDLY FLOWING SOLUTION IN A CENTRAL SECTION OF THE TOWER, WHEREBY RIGID GLOBULES OF SAID AGENT ARE FORMED; RETAINING SAID RIGID GLOBULES IN SAID MIXTURE UNTIL COMPLEX FORMATION OCCURS WITH THE FORMATION OF A COMPLEX OF SAID AGENT AND SAID COMPOUND (I) IN GENERALLY SPHEROIDAL FORM, IN CENTRAL SECTION OF SAID TOWER; THERMALLY DECOM-
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) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |