Patent US3271819A successfully refreshed from Google Patents.
US3271819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruder
Assignee: NRM Corp
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Filing: 1962-02-26
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Granted: 1966-09-13
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Expires: 1982-02-26
Abstract
No abstract record available.
Inventors
- 👤 Frederick K Lacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:47
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/03; B29C48/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
AN EXTRUDER COMPRISING A CYLINDER HAVING AN INELT FOR INTRODUCTION OF PLASTIC AND LIKE MATERIAL; A FEED SCREW ROTATABLE IN SAID CYLINDER HAVING A HELICAL FLIGHT EFFECTIVE, UPON ROTATION OF SAID FEED SCREW, TO ADVANCE MATERIAL THROUGH SAID CYLINDER FOR PLASTICIZING DURING THE COURSE OF ITS FLOW; SAID FEED SCREW HAVING SUCCESSIVE FEED, TRANSITION, AND METERING SECTIONS IN THE DIRECTION OF ADVANCE OF ITS FLOW; SAID FEED SCREW HAVING SUCCESSIVE FEED, TRANSIOF THE MATERIAL; SAID FLIGHT, IN SAID FEED AND TRANSITION SECTIONS, DEFINING A FIRST HELICAL CHANNEL THROUGH WHICH MATERIAL IS ADVANCED FROM SAID FEED SECTION INTO SAID TRANSITION SECTION AND, IN SAID TRANSITION AND METERING SECTIONS, DEFINING A SECOND HELICAL CHANNEL THROUGH WHICH MATERIAL IS ADVANCED FROM SAID TRANSITION SECTION THROUGH SAID METERING SECTION; SAID CHANNELS HAVING RESTRICTED COMMUNICATION WITH EACH OTHER IN SAID TRANSITION SECTION FOR BUILDUP OF PRESSURE IN SAID FIRST CHANNELS INTO SAID SECOND REFINED MATERIAL FROM SAID FIST CHANNEL INTO SAID SECOND CHANNEL; SAID FIRST CHANNEL BEING OF PROGRESSIVELY DECREASING AXIAL WIDTH AND PROGRESSIVELY DECREASING RADIAL DEPTH OF PROGRESSIVELY INCREASING AXIAL WIDTH AND PROGRESSIVELY DECREASING RADIAL DEPTH IN SAID TRANSITION SECTION.
Claim 2
Dependent Claim
186 words
AN EXTRUDER COMPRISING A CYLINDER HAVING AN INELT FOR INTRODUCTION OF PLASTIC AND LIKE MATERIAL; A FEED SCREW ROTATABLE IN SAID CYLINDER HAVING A HELICAL FLIGHT EFFECTIVE, UPON ROTATION OF SAID FEED SCREW, TO ADVANCE MATERIAL THROUGH SAID CYLINDER FOR PLASTICIZING DURING THE COURSE OF ITS FLOW; SAID FEED SCREW HAVING SUCCESSIVE FEED, TRANSITION, AND METERING SECTIONS IN THE DIRECTION OF ADVANCE OF ITS FLOW; SAID FEED SCREW HAVING SUCCESSIVE FEED, TRANSIOF THE MATERIAL; SAID FLIGHT, IN SAID FEED AND TRANSITION SECTIONS, DEFINING A FIRST HELICAL CHANNEL THROUGH WHICH MATERIAL IS ADVANCED FROM SAID FEED SECTION INTO SAID TRANSITION SECTION AND, IN SAID TRANSITION AND METERING SECTIONS, DEFINING A SECOND HELICAL CHANNEL THROUGH WHICH MATERIAL IS ADVANCED FROM SAID TRANSITION SECTION THROUGH SAID METERING SECTION; SAID CHANNELS HAVING RESTRICTED COMMUNICATION WITH EACH OTHER IN SAID TRANSITION SECTION FOR BUILDUP OF PRESSURE IN SAID FIRST CHANNELS INTO SAID SECOND REFINED MATERIAL FROM SAID FIST CHANNEL INTO SAID SECOND CHANNEL; SAID FIRST CHANNEL BEING OF PROGRESSIVELY DECREASING AXIAL WIDTH AND PROGRESSIVELY DECREASING RADIAL DEPTH OF PROGRESSIVELY INCREASING AXIAL WIDTH AND PROGRESSIVELY DECREASING RADIAL DEPTH IN SAID TRANSITION SECTION.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |