US3160688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion process
Assignee: Monsanto Co
•
Filing: 1961-06-02
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Granted: 1964-12-08
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Expires: 1981-06-02
Abstract
No abstract record available.
Inventors
- 👤 Ardashus A Aykanian
- 👤 Edgar E Hardy
- 👤 George A Latinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:17
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/3442; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/421; B29B7/428; B29B7/429; B29B7/80; B29B7/82; B29B7/826; B29B7/88; B29B7/94; B29C48/00; B29C48/25; B29C48/285; B29C48/29; B29B7/74; B29B7/7476; B29B7/7495; B29C48/03; B29C48/09; B29C48/10; B29K; B29K2105/00; B29K2105/0005; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A PROCESS FOR PREPARING A LOW DENSITY, EXTRUDED FOAMED THERMOPLASTIC RESIN BY FEEDING THERMOPLASTIC RESIN TO A SINGLE SCREW EXTRUDER, MELTING AND FORWARDING SAID THERMOPLASTIC RESIN THROUGH THE EXTRUDER, INJECTING A LIQUID FOAMING AGENT INTO THE MELTED RESIN AND DISCHARGING THE FOAMING AGENT CONTAINING MELTED RESIN FRO A DIE; THE IMPROVEMENT WHICH COMPRISES (1) HEATING THE RESIN IN THE FIRST ZONE OF THE EXTRUDER TO A TEMPERATURE SUCH THAT THE MELTED RESIN HAS A VISCOSITY OF LESS THAN ABOUT 1.5X10**4 POISES, (2) SUBJECTING THE MELTED RESIN TO A PRESSURE OF AT LEAST ABOUT 1700 P.S.I. IN THE FIRST ZONE OF THE EXTRUDER, (3) DELIVERING THE MELTED RESIN FROM THE FIRST ZONE OF THE EXTRUDER TO THE SECOND ZONE OF THE EXTRUDER, (4) MAINTAINING THE MELTED RESIN AT SUBSTANTIALLY THE TEMPERATURE SPECIFIEC IN STEP (1) THROUGHOUT THE SECOND ZONE OF THE EXTRUDER, (5) INJECTING A LIQUID FOAMING AGENT INTO THE MELTED RESIN IN THE SECOND ZONE OF THE EXTRUDER, (6)
Claim 2
Dependent Claim
160 words
IN A PROCESS FOR PREPARING A LOW DENSITY, EXTRUDED FOAMED THERMOPLASTIC RESIN BY FEEDING THERMOPLASTIC RESIN TO A SINGLE SCREW EXTRUDER, MELTING AND FORWARDING SAID THERMOPLASTIC RESIN THROUGH THE EXTRUDER, INJECTING A LIQUID FOAMING AGENT INTO THE MELTED RESIN AND DISCHARGING THE FOAMING AGENT CONTAINING MELTED RESIN FRO A DIE; THE IMPROVEMENT WHICH COMPRISES (1) HEATING THE RESIN IN THE FIRST ZONE OF THE EXTRUDER TO A TEMPERATURE SUCH THAT THE MELTED RESIN HAS A VISCOSITY OF LESS THAN ABOUT 1.5X10**4 POISES, (2) SUBJECTING THE MELTED RESIN TO A PRESSURE OF AT LEAST ABOUT 1700 P.S.I. IN THE FIRST ZONE OF THE EXTRUDER, (3) DELIVERING THE MELTED RESIN FROM THE FIRST ZONE OF THE EXTRUDER TO THE SECOND ZONE OF THE EXTRUDER, (4) MAINTAINING THE MELTED RESIN AT SUBSTANTIALLY THE TEMPERATURE SPECIFIEC IN STEP (1) THROUGHOUT THE SECOND ZONE OF THE EXTRUDER, (5) INJECTING A LIQUID FOAMING AGENT INTO THE MELTED RESIN IN THE SECOND ZONE OF THE EXTRUDER, (6)
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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) | 1967-12-08 | 1968-06-08 | 1968-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-08 | 1972-06-08 | 1972-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-08 | 1976-06-08 | 1976-12-08 | $7700.00 | Window Closed / Lapsed |