US2622060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of 1,2-propylene oxide
Assignee: Celanese Corp
•
Filing: 1950-01-26
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Granted: 1952-12-16
•
Expires: 1970-01-26
Abstract
No abstract record available.
Inventors
- 👤 Max O Robeson
- 👤 Wallace E Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:06
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
IN A PROCESS FOR THE SEPARATION OF 1,2-PROPYLENE OXIDE FROM A CRUDE MIXTURE OF 1,2-PROPYLENE OXIDE CONTAINING METHYL FORMATE AS AN INPURITY, THE STEP WHICH COMPRISES SUBJECTING THE CRUDE 1,2-PROPYLENE OXIDE TO AN EXTRACTIVE DISTILLATION EMPLOYING AN AQUEOUS SOLUTION OF AN INORGANIC SAPONIFYING AGENT AS THE EXTRACTANT AND REMOVING PURIFIED 1,2-PROPYLENE OXIDE AS THE DISTILLATE.
Claim 2
Dependent Claim
55 words
IN A PROCESS FOR THE SEPARATION OF 1,2-PROPYLENE OXIDE FROM A CRUDE MIXTURE OF 1,2-PROPYLENE OXIDE CONTAINING METHYL FORMATE AS AN INPURITY, THE STEP WHICH COMPRISES SUBJECTING THE CRUDE 1,2-PROPYLENE OXIDE TO AN EXTRACTIVE DISTILLATION EMPLOYING AN AQUEOUS SOLUTION OF AN INORGANIC SAPONIFYING AGENT AS THE EXTRACTANT AND REMOVING PURIFIED 1,2-PROPYLENE OXIDE AS THE DISTILLATE.
References Cited (Backward Citations)
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Cited
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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) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |