Patent US2556248A successfully refreshed from Google Patents.
US2556248A
Expired / Lapsed
US
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Ether purification by distillation and adsorption
Assignee: Standard Oil Development Co
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Filing: 1946-03-16
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Granted: 1951-06-12
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Expires: 1966-03-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Erwin H Amick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:37
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A PROCESS FOR REMOVING CONTAMINATING TRACES OF WATER AND ETHYL ALCOHOL IN THE NEIGHBORHOOD OF 0.5 WT. PER CENT FROM ETHYL ETHER CONTAINING THESE IMPURITIES WHICH COMPRISES DISTILLING THE IMPURE ETHER IN A DISTILLATION ZONE, REMOVING A PORTION OF THE WATER AS DISTILLATE IN THE FORM OF THE ETHYL ETHER-WATER AZEOTROPE, AND TREATING THE ETHER DISTILLATIN RESDIUE WITH SILICA GEL TO ADSORB THE REMAINDER OF THE WATER AND THE ALCOHOL THEREFROM.
References Cited (Backward Citations)
GB211454A
Cited
US1670053A
Cited
US1454462A
Cited
US1394232A
Cited
US1413864A
Cited
US1537260A
Cited
US1536544A
Cited
US1466436A
Cited
US1911832A
Cited
GB409053A
Cited
US2140694A
Cited
US2198651A
Cited
US2275802A
Cited
US2306610A
Cited
US2358193A
Cited
US2356890A
Cited
US2388616A
Cited
US2458819A
Cited
US2431554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |