US2950232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of tetrahydrofuran
Assignee: EIDP Inc
•
Filing: 1957-05-01
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Granted: 1960-08-23
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Expires: 1977-05-01
Abstract
No abstract record available.
Inventors
- 👤 William L Kuechler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:55
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/06; C07D307/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A FRACTIONAL DISTILLATION PROCESS FOR RECOVERING TETRAHYDROFURAN FROM A LIQUID TWO-PHASE MIXTURE COMPRISING TETRAHYDROFURAN, 1,4-DICHLOROBUTANE, TETRAMETHYLENE CHLORHYDRIN, HYDROGEN CHLORIDE AND WATER, THE STEP OF REMOVING SAID TETRAHYDROFURAN WHILE SIMULTANEOUSLY REDUCING THE CONCENTRATION OF TETRAMETHYLENE CHLORHYDRIN IN THE SAID TWO-PHASE MIXTURE BY FEEDING THE SAID TWOPHASE MIXTURE DIRECTLY INTO A DISTILLATION COLUMN, WITHDRAWING THE BOTTOM PRODUCT OF SAID DISTILLATION COLUMN, AND SEPARATING THE PHASE THEREIN, PASSING A PORTION OF THE SEPARATED AQUEOUS PHASE TO A VAPORIZER, RETURNING THE VAPORS OF SAID PORTION OF SAID AQUEOUS PHASE TO THE BOTTOM PART OF THE AFORESAID DISTILLATION COLUMN AND CONTINUOUSLY REMOVING TETRAHYDROFURAN FROM THE TOP OF SAID DISTILLATION COLUMN.
Claim 2
Dependent Claim
106 words
IN A FRACTIONAL DISTILLATION PROCESS FOR RECOVERING TETRAHYDROFURAN FROM A LIQUID TWO-PHASE MIXTURE COMPRISING TETRAHYDROFURAN, 1,4-DICHLOROBUTANE, TETRAMETHYLENE CHLORHYDRIN, HYDROGEN CHLORIDE AND WATER, THE STEP OF REMOVING SAID TETRAHYDROFURAN WHILE SIMULTANEOUSLY REDUCING THE CONCENTRATION OF TETRAMETHYLENE CHLORHYDRIN IN THE SAID TWO-PHASE MIXTURE BY FEEDING THE SAID TWOPHASE MIXTURE DIRECTLY INTO A DISTILLATION COLUMN, WITHDRAWING THE BOTTOM PRODUCT OF SAID DISTILLATION COLUMN, AND SEPARATING THE PHASE THEREIN, PASSING A PORTION OF THE SEPARATED AQUEOUS PHASE TO A VAPORIZER, RETURNING THE VAPORS OF SAID PORTION OF SAID AQUEOUS PHASE TO THE BOTTOM PART OF THE AFORESAID DISTILLATION COLUMN AND CONTINUOUSLY REMOVING TETRAHYDROFURAN FROM THE TOP OF SAID DISTILLATION COLUMN.
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) | 1963-08-23 | 1964-02-22 | 1964-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-23 | 1968-02-22 | 1968-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-23 | 1972-02-22 | 1972-08-23 | $7700.00 | Window Closed / Lapsed |