Patent US3137346A successfully refreshed from Google Patents.
Patent US3801552A successfully refreshed from Google Patents.
US3801552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process for preparing fluoroelastomer
Assignee: Daikin Industries Ltd
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Filing: 1971-12-30
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Granted: 1974-04-02
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Expires: 1991-12-30
Abstract
Abstract A FLUOROELASTOMER HAVING EXCELLENT ELASTOMERIC PROPERTY, LOWER MOONEY VISCOSITY AND SMALLER COMPRESSION SET IS ECONOMICALLY PREPARED BY SUBJECTING TETRAFLUOROETHYLENE, VINYLIDENE FLUORIDE AND HEXAFLUOROPROPENE TO THE SUSPENSION POLYMERIZATION IN AN AQUEOUS MEDIUM CONTAINING AT LEAST ONE OF THE SAID MONOMERS AND HALOGENATED HYDROCARBONS WHICH APPEAR AS A LIQUID IN THE RATIO OF 10 TO 100% BY WEIGHT TO THE EXISTING WATER IN THE PRESENCE OF AN OILSOLUBLE INITIATOR AT 1* TO 45*C. UNDER 1 TO 30 KG./CM2G.
Inventors
- 👤 Y Kometani
- 👤 Y Furukawa
- 👤 M Tomodo
- 👤 N Nakamura
- 👤 S Nakagawa
- 👤 Y Miyata
- 👤 M Oka
- 👤 T Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:18
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/22
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |