US3778391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for concentrating aqueous colloidal dispersions of polytetra-fluoroethylene
Assignee: Solvay Solexis Inc
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Filing: 1972-02-24
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Granted: 1973-12-11
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Expires: 1992-02-24
Abstract
Abstract IN THE CREAMING PROCESS FOR CONCENTRATING DILUTE AQUEOUS COLLOIDAL DISPERSIONS OF POLYTETRAFLUOROETHYLENE, USING A CREAMING AGENT NATURALLY-OCCURRING WATER-SOLUBLE COLLOIDS, IN THE PRESENCE AS STABILIZER OF NON-IONIC SURFACE ACTIVE AGENT TO OBTAIN A CONCENTRATED DISPERSION PHASE AND A SUPERNATANT AQUEOUS PHASE, FOLLOWED BY PHASE SEPARATION, VISCOSITY OF THE RESULTANT CONCENTRATED DISPERSION IS REDUCED, WITHOUT CONCOMITANT LOSS IN STABILITY, BY A PROCESS IMPROVEMENT WHICH COMPRISES ADDING AQUEOUS HYDROGEN PEROXIDE TO THE DISPERSIONS TO BE CREAMED IN AMOUNT OF ABOUT 2 TO 20 PARTS BY WEIGHT PER 100 PARTS OF CREAMING AGENT.
Inventors
- 👤 P Morris
- 👤 R Hutzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:16
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08F; C08F6/00; C08F6/14; C08F6/20; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |