Patent US2469507A successfully refreshed from Google Patents.
Patent US3358327A successfully refreshed from Google Patents.
US3358327A
Expired / Lapsed
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Screw for extrusion apparatus
Assignee: Maillefer SA
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Filing: 1960-12-20
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Granted: 1967-12-19
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Expires: 1980-12-20
Abstract
No abstract record available.
Inventors
- 👤 Charles E Maillefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:56
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/38; B29B7/40; B29B7/42; B29B7/421; B29C; B29C45/00; B29C45/17; B29C45/72; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/51; B29C48/59; B29C48/595; B29C48/64; B29C48/65; B29C45/46; B29C45/58; B29C45/60; B29C48/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
IN AN EXTENDING MACHINE, SUCH AS, THE COMBINATION OF A CYLINDER, HAVING A CYLINDER WALL TERMINATING WITH AN EXTRUSION PORT, A CONVEYOR SCREW, HAVING A TIP, PROVIDED WITH AT LEAST ONE THREAD DEFINING A SUBSTANTIALLY HELICAL GROOVE AND MOUNTED FOR ROTATION IN SAID CYLINDER WITH SAID TIP FACING SAID EXTRUSION PORT, SAID SCREW BEING PROVIDED WITH AN AXIAL CHANNEL HAVING A CLOSED END AND AN OPEN END WITH SAID OPEN AND OPENING AT SAID SCREW TIP AND WITH A PLURALITY OF RADIAL CHANNELS EXTENDING BETWEEN SAID AXIAL CHANNEL AND THE OUTER PERIPHERY OF THE SCREW THREAD, MEANS FOR FEEDING MATERIAL TO BE EXTRUDED INTO THE SCREW GROOVE, HEATING MEANS MOUNTED IN SAID CYLINDER WALL FOR MELTING THE MATERIAL AS IT PROGRESSES ALONG THE REVOLVING SCREW INSIDE THE CYLINDER, THE MATERIAL, AS IT IS HEATED IN CONTACT WITH THE INNER SURFACE OF THE CYLINDER, MELTING AND FLOWING INTO THE RADIAL CHANNELS AND THENCE INTO THE AXIAL CHANNEL OF THE SCREW TOWARDS THE TIP OF THE LATTER AND INTO THE EXTRUDING PORT OF THE CYLINDER.
Claim 2
Dependent Claim
173 words
IN AN EXTENDING MACHINE, SUCH AS, THE COMBINATION OF A CYLINDER, HAVING A CYLINDER WALL TERMINATING WITH AN EXTRUSION PORT, A CONVEYOR SCREW, HAVING A TIP, PROVIDED WITH AT LEAST ONE THREAD DEFINING A SUBSTANTIALLY HELICAL GROOVE AND MOUNTED FOR ROTATION IN SAID CYLINDER WITH SAID TIP FACING SAID EXTRUSION PORT, SAID SCREW BEING PROVIDED WITH AN AXIAL CHANNEL HAVING A CLOSED END AND AN OPEN END WITH SAID OPEN AND OPENING AT SAID SCREW TIP AND WITH A PLURALITY OF RADIAL CHANNELS EXTENDING BETWEEN SAID AXIAL CHANNEL AND THE OUTER PERIPHERY OF THE SCREW THREAD, MEANS FOR FEEDING MATERIAL TO BE EXTRUDED INTO THE SCREW GROOVE, HEATING MEANS MOUNTED IN SAID CYLINDER WALL FOR MELTING THE MATERIAL AS IT PROGRESSES ALONG THE REVOLVING SCREW INSIDE THE CYLINDER, THE MATERIAL, AS IT IS HEATED IN CONTACT WITH THE INNER SURFACE OF THE CYLINDER, MELTING AND FLOWING INTO THE RADIAL CHANNELS AND THENCE INTO THE AXIAL CHANNEL OF THE SCREW TOWARDS THE TIP OF THE LATTER AND INTO THE EXTRUDING PORT OF THE CYLINDER.
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) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |