US3663668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sonic nucleation in foam extrusion
Assignee: FMC Corp
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Filing: 1968-02-28
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Granted: 1972-05-16
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Expires: 1988-02-28
Abstract
Abstract METHOD IN WHICH A GAS IS DISSOLVED WITHIN A MOLTEN THERMOPLASTIC POLYMER DURING ITS PASSAGE THROUGH AN EXTRUDER TO PROVIDE A SUPER-SATURATED SOLUTION OF DISSOLVED GAS THEREIN AS SUCH POLYMER APPROACHES AND ENTERS A REGION OF LOWER PRESSURE OUTWARDLY OF THE EXTRUDER. AT A LOCATION NEAR THE BEGINNING OF THE ZONE OF THE SUPERSATURATED SOLUTION OF DISSOLVED GAS, THE THERMOPLASTIC POLY- MER IS SUBJECTED TO SONIC VIBRATIONS TO CAUSE INCIPIENT BUBBLE FORMATION THEREIN. SUCH BUBBLES ARE PERMITTED TO EXPAND IN THE REGION OF LOWER PRESSURE, AFTER WHICH THE THERMOPLASTIC POLYMER IS QUENCHED.
Inventors
- 👤 Theodore H Fairbanks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:42
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3469; B29C44/3442; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29C2791/00; B29C2791/004; B29C2791/008; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S264/16; Y10S521/00; Y10S521/915
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |