Patent US3039940A successfully refreshed from Google Patents.
US3039940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification
Assignee: Celanese Corp
•
Filing: 1959-11-02
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Granted: 1962-06-19
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Expires: 1979-11-02
Abstract
No abstract record available.
Inventors
- 👤 Prinz Roy
- 👤 Gann James
- 👤 Ramey James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:02
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR THE SEPARATION OF PROPYLENE OXIDE FROM A CRUDE MIXTURE CONTAINING THE PROPYLENE OXIDE AND CONTAINING METHYLAL AS AN IMPURITY, COMPRISING SUBJECTING THE CRUDE MIXTURE TO AN EXTRACTIVE DISTILLATION WITH A HYDROCARBON SOLVENT AS THE EXTRACTANT.
Claim 2
Dependent Claim
38 words
A PROCESS FOR THE SEPARATION OF PROPYLENE OXIDE FROM A CRUDE MIXTURE CONTAINING THE PROPYLENE OXIDE AND CONTAINING METHYLAL AS AN IMPURITY, COMPRISING SUBJECTING THE CRUDE MIXTURE TO AN EXTRACTIVE DISTILLATION WITH A HYDROCARBON SOLVENT AS THE EXTRACTANT.
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) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |