US2764607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of phosgene in the production of chloroformates
Assignee: Celanese Corp
•
Filing: 1952-07-26
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Granted: 1956-09-25
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Expires: 1972-07-26
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Hieserman
- 👤 Walter R Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:36
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/96; C01; C01B; C01B32/00; C01B32/70; C01B32/80; C01B7/00; C01B7/01; C01B7/07; C01B7/0706; C01B7/0731; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
IN THE PROCESS OF MAKING A CHLOROFORMATE BY THE REACTION OF EXCESS PHOSGENE WITH A HYDROXY COMPOUND, IN WHICH MIXTURE OF PHOSGENE AND HYDROGEN CHLORIDE IS GIVEN OFF FROM SAID REACTION, THE IMPROVEMENT WHICH COMPRISES PASSING SAID MIXTURE THROUGH A COOLED ZONE TO REMOVE A PORTION OF ITS PHOSGENE CONTENT BY CONDENSATION AND PASSING THE REMAINING UNCONDENSED MIXTURE INTO CONTACT WITH A LIQUID PREFERENTIAL SOLVENT FOR THE PHOSGENE, SAID SOLVENT BEING SELECTED FROM THE CLASS CONSISTING OF CHLOROBENZENE, DICHLOROETHANE, CHLOROFORM, CARBON TETRACHLORIDE, XYLENE, BENZENE, GASOLINE, ACETIC ACID AND ETHYL ACETATE, AT A TEMPERATURE BELOW 0* C. TO EXTRACT THE PHOSGENE FROM SAID MIXTURE.
Claim 2
Dependent Claim
103 words
IN THE PROCESS OF MAKING A CHLOROFORMATE BY THE REACTION OF EXCESS PHOSGENE WITH A HYDROXY COMPOUND, IN WHICH MIXTURE OF PHOSGENE AND HYDROGEN CHLORIDE IS GIVEN OFF FROM SAID REACTION, THE IMPROVEMENT WHICH COMPRISES PASSING SAID MIXTURE THROUGH A COOLED ZONE TO REMOVE A PORTION OF ITS PHOSGENE CONTENT BY CONDENSATION AND PASSING THE REMAINING UNCONDENSED MIXTURE INTO CONTACT WITH A LIQUID PREFERENTIAL SOLVENT FOR THE PHOSGENE, SAID SOLVENT BEING SELECTED FROM THE CLASS CONSISTING OF CHLOROBENZENE, DICHLOROETHANE, CHLOROFORM, CARBON TETRACHLORIDE, XYLENE, BENZENE, GASOLINE, ACETIC ACID AND ETHYL ACETATE, AT A TEMPERATURE BELOW 0* C. TO EXTRACT THE PHOSGENE FROM SAID MIXTURE.
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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) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |