US2820809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of haloethyl haloformates
Assignee: Dow Chemical Co
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Filing: 1956-08-16
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Granted: 1958-01-21
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Expires: 1976-08-16
Abstract
No abstract record available.
Inventors
- 👤 Ludo K Frevel
- 👤 Leonard J Kressley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:45
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/96; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR PREPARING A 2-HALOETHYL HALOFORMATE WHICH COMPRISES REACTING IN THE VAPOR PHASE A MIXTURE OF ETHYLENE OXIDE WITH AT LEAST A MOLAR EQUIVALENT OF A CARBONYL HALIDE OF HE GROUP CONSISTING OF PHOSGENE AND ITS HALOGEN ANALOGS CONTAINING NO MORE THAN ONE FLUORO SUBSTITUENT IN THE PRESENCE OF A CATALYTIC AMOUNT OF AT LEAST ONE HYDROGEN HALIDE OF THE GROUP CONSISTING OF HYDROGEN CHLORIDE, HYDROGEN BROMIDE AND HYDROGEN IODIDE AT TEMPERATURES BETWEEN THE BOILING POINT AND THE DECOMPOSITION TEMPERATURE OF ETHYLENE OXIDE, CONDENSING LIQUID REACTION PRODUCTS AND SEPARATING AND RECOVERING 2-HALOETHYL HALOFORMATE FROM THE LIQUID CONDENSATE.
Claim 2
Dependent Claim
98 words
A PROCESS FOR PREPARING A 2-HALOETHYL HALOFORMATE WHICH COMPRISES REACTING IN THE VAPOR PHASE A MIXTURE OF ETHYLENE OXIDE WITH AT LEAST A MOLAR EQUIVALENT OF A CARBONYL HALIDE OF HE GROUP CONSISTING OF PHOSGENE AND ITS HALOGEN ANALOGS CONTAINING NO MORE THAN ONE FLUORO SUBSTITUENT IN THE PRESENCE OF A CATALYTIC AMOUNT OF AT LEAST ONE HYDROGEN HALIDE OF THE GROUP CONSISTING OF HYDROGEN CHLORIDE, HYDROGEN BROMIDE AND HYDROGEN IODIDE AT TEMPERATURES BETWEEN THE BOILING POINT AND THE DECOMPOSITION TEMPERATURE OF ETHYLENE OXIDE, CONDENSING LIQUID REACTION PRODUCTS AND SEPARATING AND RECOVERING 2-HALOETHYL HALOFORMATE FROM THE LIQUID CONDENSATE.
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |