US3183277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of fluorethylenes
Assignee: Hoechst AG
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Filing: 1961-03-10
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Granted: 1965-05-11
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Expires: 1981-03-10
Abstract
No abstract record available.
Inventors
- 👤 Scherer Otto
- 👤 Steinmetz Alfons
- 👤 Kuhn Heinrich
- 👤 Grafen Karlheinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:22
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/269; B; B01; B01J; B01J12/00; B01J12/005; C07C17/23; C07C17/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN THE PROCESS FOR PREPARING FLUORETHYLENES BY PYROLYTIC DEHYDROCHLORINATION OF A COMPOUND OF THE FORMULA RCF2CL, IN WHICH R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, METHYL, AND MEHYL SUBSTITUTED BY FROM ONE TO TWO HALOGEN ATOMS HAVING AN ATOMIC WEIGHT OF AT MOST 36, THE IMPROVEMENT WHICH COMPRISES PYROLYZING SAID COMOUND BY PASSING IT IN THE GASEOUS STATE THROUGH A REACTION ZONE HAVING A SLIT-SHAPED CROSSSECTION DEFINED BY A SINGLE SELF-RECURRENT LINE, THE LENGTHTO-WIDTH RATIO OF SAID SLIT-SHAPED CROSS-SECTION BEING AT LEAST 2:1, AND THE WIDTH OF SAID SECTION BEING BETWEEN 1.5 MM. AND 18 MM.
Claim 2
Dependent Claim
100 words
IN THE PROCESS FOR PREPARING FLUORETHYLENES BY PYROLYTIC DEHYDROCHLORINATION OF A COMPOUND OF THE FORMULA RCF2CL, IN WHICH R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, METHYL, AND MEHYL SUBSTITUTED BY FROM ONE TO TWO HALOGEN ATOMS HAVING AN ATOMIC WEIGHT OF AT MOST 36, THE IMPROVEMENT WHICH COMPRISES PYROLYZING SAID COMOUND BY PASSING IT IN THE GASEOUS STATE THROUGH A REACTION ZONE HAVING A SLIT-SHAPED CROSSSECTION DEFINED BY A SINGLE SELF-RECURRENT LINE, THE LENGTHTO-WIDTH RATIO OF SAID SLIT-SHAPED CROSS-SECTION BEING AT LEAST 2:1, AND THE WIDTH OF SAID SECTION BEING BETWEEN 1.5 MM. AND 18 MM.
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) | 1968-05-10 | 1968-11-09 | 1969-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-10 | 1972-11-09 | 1973-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-10 | 1976-11-09 | 1977-05-11 | $7700.00 | Window Closed / Lapsed |