Patent US3664116A successfully refreshed from Google Patents.
US3707592A
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Processes for suspension-polymerizing vinylidene fluoride and orienting the melt extruded polymer
Assignee: Kureha Corp
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Filing: 1970-01-15
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Granted: 1972-12-26
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Expires: 1990-01-15
Abstract
Abstract VINYLIDENE FLUORIDE POLYMERS HAVING A CRYSTALLIZATION TEMPERATURE ABOVE 135*C. AND A MELTING TEMPERATURE ABOVE 175*C. ARTICLES SUCH AS FIBERS, FILMS, ETC., MADE FROM SUCH POLYMERS, HAVE EXCELLENT HEAT-RESISTANT PROPERTIES AND HIGH MECHANICAL STRENGTH. THE AFOREMENTIONED POLYMERS MAY BE PRODUCED BY SUSPENSION POLYMERIZING POLYVINYLIDENE FLUORIDE IN A WATER MEDIUM AT A TEMPERATURE PREFERABLY BETWEEN 0*C. AND 30*C. IN THE PRESENCE OF A CATALYST WHICH MAY BE A DIALKYL PEROXY DICARBONATE OR A DIALKYL PEROXY CARBONATE.
Inventors
- 👤 Hajime Ishii
- 👤 Nobuo Bannai
- 👤 Sadao Nishita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:22
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08F; C08F14/00; C08F14/18; C08F14/22; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/16; D; D01; D01F; D01F6/00; D01F6/02; D01F6/08; D01F6/12; C08F2438/00; C08F2438/01; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/16; Y; Y10; Y10S; Y10S264/00; Y10S264/73; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154
Claims Analysis
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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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |