US3170190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion apparatus
Assignee: EIDP Inc
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Filing: 1963-08-06
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Granted: 1965-02-23
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Expires: 1983-08-06
Abstract
No abstract record available.
Inventors
- 👤 Fields Reuben Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:46
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/76; B29C48/765; B29C48/766; B29C48/767; B29C48/03; Y; Y10; Y10S; Y10S264/00; Y10S264/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
IN AN EXTRUDER FOR PLASTIC AND LIKE MATERIALS COMPRISING AN EXTRUDER SCREW OF SUBSTANTIALLY UNIFORM DIAMETER, ROTATABLY LOCATED IN A HORIZONTALLY DISPOSED EXTRUSION BARREL, SAID EXTRUSION BARREL HAVING AN INLET PORT AND AN OUTLET PORT IN CLOSE PROXIMITY TO OPPOSITE ENDS OF THE EXTRUDER, SAID EXTRUDER SCREW COMPRISING AT LEAST TWO HELICALLY GROOVED TANDEMLY ARRANGED COMPRESSIVE SCREW SECTIONS HAVING THE SAME DIRECTION OF HELICAL TWIST, SEPARATED BY AN INTERMEDIATE SECTION, SAID INTERMEDIATE SECTION BEING LOCATED BETWEEN SAID INLET PORT AND SAID OUTLET PORT OF SAID EXTRUSION BARREL, SAID EXTRUSION BARREL HAVING AT LEAST ONE DEVOLATILIZATION PORT LOCATED IN THE BARREL WALL SURROUNDING THE INTERMEDIATE SECTION OF THE EXTRUDER SCREW, THE IMPROVEMENT WHICH COMPRISES A RECESS IN THE WALL OF THE EXTRUSION BARREL BEGINNING AT THE POINT OF ENTRY OF THE DEVOLATILIZATION PORT, SAID RECESS EXTENDING AROUND SAID BARREL ON ITS INTERNAL SURFACE IN THE DIRECTION IN WHICH THE EXTRUDER SCREW IS ADAPTED TO TURN.
Claim 2
Dependent Claim
154 words
IN AN EXTRUDER FOR PLASTIC AND LIKE MATERIALS COMPRISING AN EXTRUDER SCREW OF SUBSTANTIALLY UNIFORM DIAMETER, ROTATABLY LOCATED IN A HORIZONTALLY DISPOSED EXTRUSION BARREL, SAID EXTRUSION BARREL HAVING AN INLET PORT AND AN OUTLET PORT IN CLOSE PROXIMITY TO OPPOSITE ENDS OF THE EXTRUDER, SAID EXTRUDER SCREW COMPRISING AT LEAST TWO HELICALLY GROOVED TANDEMLY ARRANGED COMPRESSIVE SCREW SECTIONS HAVING THE SAME DIRECTION OF HELICAL TWIST, SEPARATED BY AN INTERMEDIATE SECTION, SAID INTERMEDIATE SECTION BEING LOCATED BETWEEN SAID INLET PORT AND SAID OUTLET PORT OF SAID EXTRUSION BARREL, SAID EXTRUSION BARREL HAVING AT LEAST ONE DEVOLATILIZATION PORT LOCATED IN THE BARREL WALL SURROUNDING THE INTERMEDIATE SECTION OF THE EXTRUDER SCREW, THE IMPROVEMENT WHICH COMPRISES A RECESS IN THE WALL OF THE EXTRUSION BARREL BEGINNING AT THE POINT OF ENTRY OF THE DEVOLATILIZATION PORT, SAID RECESS EXTENDING AROUND SAID BARREL ON ITS INTERNAL SURFACE IN THE DIRECTION IN WHICH THE EXTRUDER SCREW IS ADAPTED TO TURN.
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) | 1968-02-23 | 1968-08-24 | 1969-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-23 | 1972-08-24 | 1973-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-23 | 1976-08-24 | 1977-02-23 | $7700.00 | Window Closed / Lapsed |