US3345317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emulsion polymerization of tetrafluoroethylene using trifluorotrichloroethane as emulsion stabilizer
Assignee: Zeneca Inc
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Filing: 1964-03-31
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Granted: 1967-10-03
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Expires: 1984-03-31
Abstract
No abstract record available.
Inventors
- 👤 Hoashi Juzaemon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:41
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/18; C08F14/26; C08F2438/00; C08F2438/01
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
AN AQUEOUS EMULSION OF A POLY(TETRAFLUOROETHYLENE) CONSISTING ESSENTIALLY OF AN AQUEOUS DISPERSION OF (A) FROM ABOUT 20 TO AB OUT 65 PERCENT BY WEIHT OF A NORMALLY SOLID POLYMER OF TETRAFLUOROETHYLENE, (B) FROM ABOUT 1 TO 30 PERCENT BY WEIGHT OFHIGHLY PURIFIED TRIFLUOROTRICHLOROETHANE HAVING A DEGREE OF PURITY SUCH THAT IS INFRARED SPECTROPHOTOMETRIC ABSORPTION, AS DETERMINED IN A CELL OF 0.5 MM. THICKNESS, AT 5.7$ IS LESS THAN 0.003 WHEN MEASURED FROM A BASE LINE DRAWN BETWEEN SHOULDERS WHICH APPEAR AT 5.6$ AND 5.93$, AND (C) FROM 0.01 TO ABOUT 10 PERCENT BY WEIGHT OF AN EMULSIFYING AGENT FOR SAID POLYMER OF TETRAFLUOROETHYLENE, ALL PERCENTAGES EXCEPT THOSE DESIGNATING THE SOLIDS CONCENTRATION OF THE POLYMER BEING BASED ON THE WEIGHT OF THE WATER CONTAINED IN THE AQUEOUS EMULSION.
References Cited (Backward Citations)
US2752331A
Cited
US2965595A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |