Patent US3632847A successfully refreshed from Google Patents.
US3632847A
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Process for polymerizing fluorine-containing monomers using acids of metals as catalyst
Assignee: Hoechst AG
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Filing: 1969-02-25
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Granted: 1972-01-04
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Expires: 1989-02-25
Abstract
Abstract THE PRESENT INVENTION IS RELATED TO A PROCESS FOR THE MANUFACTURE OF POLYMERS AND COPOLYMERS OF FLUORINE-CONTAINING OLEFINS AT RELATIVELY LOW TEMPERATURES IN THE RANGE OF FROM 0 TO 50*C. AND AT ATMOSPHERIC OR SLIGHTLY ELEVATED PRESSURE. THE POLYMERIZATION IS CATALYZED BY ACIDS OR SALTS OF ACIDS OF SUBGROUP V TO VII METALS OR BY COMPOUNDS WHICH ARE CONVERTED INTO SUCH ACIDS UNDER THE REACTION CONDITIONS.
Inventors
- 👤 Robert Hartwimmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:00
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |