Patent US2005615A successfully refreshed from Google Patents.
US2550847A
Expired / Lapsed
US
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Propylene oxide purification
Assignee: —
•
Filing: —
•
Granted: 1951-05-01
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Expires: 1968-05-01
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:53
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN A PROCESS FOR THE SEPARATION OF 1,2PROPYLENE OXIDE FROM A CRUDE MIXTURTE OF 1,2PROPYLENE OXIDE CONTAINING METHYL FORMATE AS AN IMPURITY, THE STEP WHICH COMPRISES SUBJECTING THE CRUDE 1,2-PROPYLENE OXIDE TO STRONG AGITATION IN ADMIXTURE WITH AN AQUEOUS SOLUTION OF AN ALKALINE SAPONIFYING AGENT, AND THEN SEPARATING THE RESULTING REACTION MIXTURE INTO LAYERS ONE LAYER COMPRISING AN AQUEOUS SOLUTION OF THE WATER SOLUBLE COMPONENTS AND THE OTHER COMPRISING 1,2-PROPYLENE OXIDE ESSENTIALLY FREE OF METHYL FORMATE.
Claim 2
Dependent Claim
76 words
IN A PROCESS FOR THE SEPARATION OF 1,2PROPYLENE OXIDE FROM A CRUDE MIXTURTE OF 1,2PROPYLENE OXIDE CONTAINING METHYL FORMATE AS AN IMPURITY, THE STEP WHICH COMPRISES SUBJECTING THE CRUDE 1,2-PROPYLENE OXIDE TO STRONG AGITATION IN ADMIXTURE WITH AN AQUEOUS SOLUTION OF AN ALKALINE SAPONIFYING AGENT, AND THEN SEPARATING THE RESULTING REACTION MIXTURE INTO LAYERS ONE LAYER COMPRISING AN AQUEOUS SOLUTION OF THE WATER SOLUBLE COMPONENTS AND THE OTHER COMPRISING 1,2-PROPYLENE OXIDE ESSENTIALLY FREE OF METHYL FORMATE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |