US3327031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the extrusion of improved closed-cell foams
Assignee: EIDP Inc
•
Filing: 1964-01-22
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Granted: 1967-06-20
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Expires: 1984-01-22
Abstract
No abstract record available.
Inventors
- 👤 Boyer Nolan Davidson
- 👤 Otto Kenneth Wayne
- 👤 Trehu Yves Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:26
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; Y; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A PROCESS FOR THE EXTRUSION OF THERMOPLASTIC RESINS INTO FOAM WHICH COMPRISES HEATING A THERMOPLASTIC RESIN TO A TEMPERATURE ABOVE THE MELTING POINT, MAINTAINING THE RESULTING MELT UNDER PRESSURE, DISSOLVING AN INERT COMPOUND GASEOUS AT THE MELTING POINT OF THE MIXTURE, THEREAFTER EXTRUDING SAID COMPOSISITION OF POLYMER MELT AND DISSOLVED INERT GASEOUS COMPOUND AT A TEMPERATURE ABOVE THE MELTING POINT OF THE MIXTURE THROUGH AN ORIFICE INTO A MEDIUM MAINTAINED AT SUBSTANTIALLY ATMOSPHERIC PRESSURE, APPLYING TO THE EXTRUDATE AT THE ORIFICE BEFORE SUBSTANTIAL FOAM FORMATION PULSATING MECHANICAL
Claim 2
Dependent Claim
87 words
A PROCESS FOR THE EXTRUSION OF THERMOPLASTIC RESINS INTO FOAM WHICH COMPRISES HEATING A THERMOPLASTIC RESIN TO A TEMPERATURE ABOVE THE MELTING POINT, MAINTAINING THE RESULTING MELT UNDER PRESSURE, DISSOLVING AN INERT COMPOUND GASEOUS AT THE MELTING POINT OF THE MIXTURE, THEREAFTER EXTRUDING SAID COMPOSISITION OF POLYMER MELT AND DISSOLVED INERT GASEOUS COMPOUND AT A TEMPERATURE ABOVE THE MELTING POINT OF THE MIXTURE THROUGH AN ORIFICE INTO A MEDIUM MAINTAINED AT SUBSTANTIALLY ATMOSPHERIC PRESSURE, APPLYING TO THE EXTRUDATE AT THE ORIFICE BEFORE SUBSTANTIAL FOAM FORMATION PULSATING MECHANICAL
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |