Patent US2856439A successfully refreshed from Google Patents.
US2856439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of fluorinated polymers
Assignee: Hoechst AG
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Filing: 1954-09-09
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Granted: 1958-10-14
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Expires: 1974-09-09
Abstract
No abstract record available.
Inventors
- 👤 Frey Hans-Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:32
CPC Classifications
C; C08; C08F; C08F114/00; C08F114/18; C08F114/26; C08F114/24; C08F14/00; C08F14/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR CARRYING OUT A CHAIN TRANSFER REACTION WHICH COMPRISES REACTING A POLYMERIZABLE PERFLUOROHALOOLEFIN HAVING NOT MORE THAN FOUR CARBON ATOMS PER MOLECULE IN THE VAPOR PHASE, AT A TEMPERATURE BETWEEN ABOUT 130*C. AND 400*C. IN THE PRESENCE OF A DIALKYL PEROXIDE IN ADMIXTURE WITH A PEROXIDE SELECTED FROM THE GROUP CONSISTING OF ALKYL HYDROPEROXIDES, KETOPEROXIDES, AND PERACID ESTERS, AND A NON-POLYMERIZABLE CHLORINATED ALIPHATIC OLEFIN HAVING AT LEAST THREE CHLORINE ATOMS ATTACHED TO THE CARBON ATOMS OF AN OLEFIN DOUBLE BOND.
Claim 2
Dependent Claim
82 words
A PROCESS FOR CARRYING OUT A CHAIN TRANSFER REACTION WHICH COMPRISES REACTING A POLYMERIZABLE PERFLUOROHALOOLEFIN HAVING NOT MORE THAN FOUR CARBON ATOMS PER MOLECULE IN THE VAPOR PHASE, AT A TEMPERATURE BETWEEN ABOUT 130*C. AND 400*C. IN THE PRESENCE OF A DIALKYL PEROXIDE IN ADMIXTURE WITH A PEROXIDE SELECTED FROM THE GROUP CONSISTING OF ALKYL HYDROPEROXIDES, KETOPEROXIDES, AND PERACID ESTERS, AND A NON-POLYMERIZABLE CHLORINATED ALIPHATIC OLEFIN HAVING AT LEAST THREE CHLORINE ATOMS ATTACHED TO THE CARBON ATOMS OF AN OLEFIN DOUBLE BOND.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |