Patent US2527017A successfully refreshed from Google Patents.
US2527017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of secondary lower alkyl amines
Assignee: Shell Development Co
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Filing: 1947-01-28
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Granted: 1950-10-24
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Expires: 1967-01-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Daniel B Luten
- 👤 Benedictis Aldo De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:22
CPC Classifications
C; C07; C07C; C07C213/00; C07C213/10; C07C209/00; C07C209/62; C07C209/82; C07C209/86; C07C211/00; C07C211/01; C07C211/02; C07C211/03; C07C211/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
THE METHOD OF SEPARATING A SECONDARY LOWER ALKYL AMINE FROM CRUDE SECONDARY ALIPHATIC AMINE CONTAINING SAID SECONDARY LOWER ALKYL AMINE IN ADMIXTURE WITH IMPURITIES COMPRISING A PRIMARY ALIPHATIC AMINE, WHICH COMPRISES INTRODUCING INTO AN EXTRACTION ZONE A NORMALLY LIQUID PARAFFINIC HYDROCARBON SOLVENT, SEPARATELY INTRODUCING INTO SAID EXTRACTION ZONE A BACHWASH AT A POINT REMOTE FROM THE POINT OF INTRODUCTION OF SAID SOLVENT, SAID BACKWASH BEING IMMISCIBLE WITH SAID SECONDARY AMINE AND MISCIBLE WITH SAID IMPURITIES COMPRISING SAID PRIMARY AMINE, INTRODUCING SAID CRUDE SECONDARY AMINE INTO SAID EXTRACTION ZONE AT A POINT INTERMEDIATE THE POINTS OF INTRODUCTION OF SAID SOLVENT AND SAID BACKWASH, THEREBY FORMING AN EXTRACT PHASE CONSISTING ESSENTIALLY OF SAID SECONDARY AMINE AND SAID SOLVENT AND A RAFFINATE PHASE CONSISTING ESSENTIALLY OF SAID PRIMARY AMINE-CONTAINING IMPURITIES IN ADMIXTURE WITH SAID BACKWASH IN SAID EXTRACTION ZONE, SEPARATELY WITHDRAWING SAID EXTRACT AND RAFFINATE PHASES FROM SAID EXTRACTION ZONE, AND SEPARATING SAID SECONDARY AMINE FROM SAID EXTRACT PHASE.
Claim 2
Independent Claim
156 words
THE METHOD OF SEPARATING A SECONDARY LOWER ALKYL AMINE FROM CRUDE SECONDARY ALIPHATIC AMINE CONTAINING SAID SECONDARY LOWER ALKYL AMINE IN ADMIXTURE WITH IMPURITIES COMPRISING A PRIMARY ALIPHATIC AMINE, WHICH COMPRISES INTRODUCING INTO AN EXTRACTION ZONE A NORMALLY LIQUID PARAFFINIC HYDROCARBON SOLVENT, SEPARATELY INTRODUCING INTO SAID EXTRACTION ZONE A BACHWASH AT A POINT REMOTE FROM THE POINT OF INTRODUCTION OF SAID SOLVENT, SAID BACKWASH BEING IMMISCIBLE WITH SAID SECONDARY AMINE AND MISCIBLE WITH SAID IMPURITIES COMPRISING SAID PRIMARY AMINE, INTRODUCING SAID CRUDE SECONDARY AMINE INTO SAID EXTRACTION ZONE AT A POINT INTERMEDIATE THE POINTS OF INTRODUCTION OF SAID SOLVENT AND SAID BACKWASH, THEREBY FORMING AN EXTRACT PHASE CONSISTING ESSENTIALLY OF SAID SECONDARY AMINE AND SAID SOLVENT AND A RAFFINATE PHASE CONSISTING ESSENTIALLY OF SAID PRIMARY AMINE-CONTAINING IMPURITIES IN ADMIXTURE WITH SAID BACKWASH IN SAID EXTRACTION ZONE, SEPARATELY WITHDRAWING SAID EXTRACT AND RAFFINATE PHASES FROM SAID EXTRACTION ZONE, AND SEPARATING SAID SECONDARY AMINE FROM SAID EXTRACT 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) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |