US2681333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gorin
Assignee: —
•
Filing: —
•
Granted: 1954-06-15
•
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
2026-11-01 15:55
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152; C07C275/00; C07C275/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
224 words
THE METHOD FRO SELECTIVELY SEPARATING A STRAIGHT CHAIN COMPOUND REPRESENTED BY GENERAL FORMULA A: @SP X(CH2)NCH3 @SP WHERERIN X IS A MONOVALENT GROUP AND N IS A WHOLE NUMBER, SAID COMPOUND (A) BEING SELECTED FROM THE GROUP CONSISTING OF: ONE IN WHICH N IS GREATER THAN ABOUT 4 TO 6 AND IN WHICH THE "WIDTH" OF X IS LESS THAN ABOUT 2.3 A*, ONE IN WHICH N IS GREATER THAN ABOUT 6 TO 10 IN WHICH THE "WIDTH" OF X IS BETWEEN ABOUT 2.3 A* AND ABOUT 3.7 A*, ONE IN WHICH N IS GREATER THAN ABOUT 10 TO 16 AND IN WHICH THE "WIDTH" OF X IS BETWEEN ABOUT 3.7 A* AND ABOUT 5.2 A*, AND ONE IN WHICH N IS GREATER THAN ABOUT 16 AND IN WHICH THE "WIDTH" OF X IS GREATER THAN ABOUT 5.2 A*, FROM A MIXTURE CONSISTING ESSENTIALLY OF SAID COMPOUND (A) AND AT LEAST ONE STRAIGHT CHAIN COMPOUND REPRESENTED BY GENERAL FORMULA B: @SP X''(CH2)NCH3 @SP WHEREIN X'' IS A DIFFERENT MONOVALENT GROUP OF GREATER "WIDTH" THAN X, AND N IS THE SAME AS IN (A), WHICH COMPRISES: CONTACTING SAID MIXTURE WITH UREA UNDER CONDITIONS APPROPRIATE FOR THE FORMATION OF A CRYSTALLINE COMPLEX WITH SAID COMPOUND (A), WHEREBY SAID COMPOUND (A) PREFERENTIALLY FORMS A CRYSTALLINE COMPLEX WITH UREA; AND SEPARATING SAID COMPLES FROM THE MIXTURE THUS FORMED.
Claim 2
Independent Claim
224 words
THE METHOD FRO SELECTIVELY SEPARATING A STRAIGHT CHAIN COMPOUND REPRESENTED BY GENERAL FORMULA A: @SP X(CH2)NCH3 @SP WHERERIN X IS A MONOVALENT GROUP AND N IS A WHOLE NUMBER, SAID COMPOUND (A) BEING SELECTED FROM THE GROUP CONSISTING OF: ONE IN WHICH N IS GREATER THAN ABOUT 4 TO 6 AND IN WHICH THE "WIDTH" OF X IS LESS THAN ABOUT 2.3 A*, ONE IN WHICH N IS GREATER THAN ABOUT 6 TO 10 IN WHICH THE "WIDTH" OF X IS BETWEEN ABOUT 2.3 A* AND ABOUT 3.7 A*, ONE IN WHICH N IS GREATER THAN ABOUT 10 TO 16 AND IN WHICH THE "WIDTH" OF X IS BETWEEN ABOUT 3.7 A* AND ABOUT 5.2 A*, AND ONE IN WHICH N IS GREATER THAN ABOUT 16 AND IN WHICH THE "WIDTH" OF X IS GREATER THAN ABOUT 5.2 A*, FROM A MIXTURE CONSISTING ESSENTIALLY OF SAID COMPOUND (A) AND AT LEAST ONE STRAIGHT CHAIN COMPOUND REPRESENTED BY GENERAL FORMULA B: @SP X''(CH2)NCH3 @SP WHEREIN X'' IS A DIFFERENT MONOVALENT GROUP OF GREATER "WIDTH" THAN X, AND N IS THE SAME AS IN (A), WHICH COMPRISES: CONTACTING SAID MIXTURE WITH UREA UNDER CONDITIONS APPROPRIATE FOR THE FORMATION OF A CRYSTALLINE COMPLEX WITH SAID COMPOUND (A), WHEREBY SAID COMPOUND (A) PREFERENTIALLY FORMS A CRYSTALLINE COMPLEX WITH UREA; AND SEPARATING SAID COMPLES FROM THE MIXTURE THUS FORMED.
References Cited (Backward Citations)
US2520716A
Cited
GB443795A
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US2116640A
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US2300134A
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US2275809A
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US2346632A
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US2376008A
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US2520715A
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US2549372A
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US2596344A
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US2557257A
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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 |