Patent US3679709A successfully refreshed from Google Patents.
US3679709A
Expired / Lapsed
US
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Preparation of octafluorotetrahydrofuran
Assignee: Dow Chemical Co
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Filing: 1970-07-06
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Granted: 1972-07-25
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Expires: 1990-07-06
Abstract
Abstract Disclosed is a process for the preparation of octafluorotetrahydrofuran. The process involves reacting perfluoroglutaryl fluoride with fluorine in the presence of KF, CsF, AgF or RbF as catalyst. The reaction is carried out at a temperature within the range of from about -196* to 25* C.
Inventors
- 👤 Hughie R Frick
- 👤 Richard W Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:00
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/04; C07D307/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
The process of claim 1 wherein the reaction temperature is within the range of from -150* to -50* C.
Claim 2
Dependent Claim
10 words
The process of claim 1 wherein the catalyst is CsF.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the catalyst is finely ground and intermixed with a heat transferring material.
Claim 4
Dependent Claim
13 words
The process of claim 4 wherein the heat transferring material is stainless steel.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein stoichiometric quantities of perfluoroglutaryl fluoride and fluorine are reacted.
References Cited (Backward Citations)
GB1138190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |