Patent US5415175A successfully refreshed from Google Patents.
US2820810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of haloalkyl 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
2026-10-25 17:33
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/96; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A LIQUID PHASE REACTION PROCESS FOR PREPARING A HALOALKYL HALOFORMATE WHICH COMPRISES REACTING ONE MOLAR PROPORTION OF A CARBONYL HALIDE OF THE GROUP CONSISTING OF PHOSGENE AND ITS HALOGEN ANALOGS CONTAINING NO MORE THAN ONE FLUORO SUBSTITUENT WITH ONE MOLAR PROPORTION OF A STRAIGHT CARBON CHAIN ALKYLENEOXIDE AT TEMPERATURES BETWEEN 0* AND 65*C. IN THE PRESENCE OF A CATALYTICC AMOUNT OF AT LEAST ONE HYDROGEN HALIDE CATALYST OF THE GROUP CONSISTING OF HYDROGEN CHLORIDE, HYDROGEN BROMIDE AND HYDROEN IODIDE.
Claim 2
Dependent Claim
79 words
A LIQUID PHASE REACTION PROCESS FOR PREPARING A HALOALKYL HALOFORMATE WHICH COMPRISES REACTING ONE MOLAR PROPORTION OF A CARBONYL HALIDE OF THE GROUP CONSISTING OF PHOSGENE AND ITS HALOGEN ANALOGS CONTAINING NO MORE THAN ONE FLUORO SUBSTITUENT WITH ONE MOLAR PROPORTION OF A STRAIGHT CARBON CHAIN ALKYLENEOXIDE AT TEMPERATURES BETWEEN 0* AND 65*C. IN THE PRESENCE OF A CATALYTICC AMOUNT OF AT LEAST ONE HYDROGEN HALIDE CATALYST OF THE GROUP CONSISTING OF HYDROGEN CHLORIDE, HYDROGEN BROMIDE AND HYDROEN IODIDE.
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 |