US4052277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing perfluorinated ethers
Assignee: Hoechst AG
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Filing: 1976-07-12
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Granted: 1977-10-04
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Expires: 1996-07-12
Abstract
Abstract Process for preparing perfluorinated ethers by exposing perfluorocarbonyl compounds of the formula ##STR1## wherein R 1 and R 2 mean identical or different perfluoroalkyl radicals optionally containing one or several ether-like bound oxygen atoms to light rays having a wave length of from 100 to 600 m μ, in a liquid phase, and the compounds thus prepared.
Inventors
- 👤 Thomas Martini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:01
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/12; C07C43/123; C07D; C07D319/00; C07D319/10; C07D319/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
56 words
Process for the preparation of perfluorinated ethers, which comprises exposing perfluoro-carbonyl compounds of the formula II ##STR19## wherein R 1 and R 2 mean identical or different perfluoroalkyl radicals optionally containing one or several ether-like bound oxygen atoms in a liquid phase to light rays having a wave length of from 180 to 600 m μ.
Claim 2
Dependent Claim
56 words
Process for the preparation of perfluorinated ethers, which comprises exposing perfluoro-carbonyl compounds of the formula II ##STR19## wherein R 1 and R 2 mean identical or different perfluoroalkyl radicals optionally containing one or several ether-like bound oxygen atoms in a liquid phase to light rays having a wave length of from 180 to 600 m μ.
Claim 3
Dependent Claim
23 words
Process as claimed in claim 1, wherein the radicals R 1 and R 2 have together of from 10 to 80 carbon atoms.
Claim 4
Dependent Claim
13 words
Process as claimed in claim 2, which comprises using a symmetric perfluoro-carbonyl compound.
Claim 5
Dependent Claim
11 words
Process as claimed in claim 1, wherein R 1 means ##STR20##
Claim 6
Dependent Claim
11 words
Process as claimed in claim 1, wherein R 2 means ##STR21##
References Cited (Backward Citations)
US3849504A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |