US3193877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multistage extrusion screw and alternate filters
Assignee: Eastman Kodak Co
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Filing: 1962-04-02
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Granted: 1965-07-13
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Expires: 1982-04-02
Abstract
No abstract record available.
Inventors
- 👤 Robert B Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:14
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/74; B29C48/745; B29C48/395; B29C48/03; Y; Y10; Y10S; Y10S159/00; Y10S159/20; Y10S264/00; Y10S264/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
APPARATUS FOR EXTRUDING AND MIXING THERMOPLASTIC COMPOSITIONS COMPRISING A HEATED EXTRUSION CYLINDER, A MULTI-STAGE EXTRUSION SCREW POSITIONED THEREIN, MEANS FOR ROTATING SAID SCREW, SAID SCREW HAVING A PLASTICIZING AND METERING STAGE, A FLOW RESTRICTION STAGE, A GAS RELEASING STAGE, A PUMPING STAGE, A FIRST CONDUIT IN FLUID COMMUNICATION WITH THE EXTRUSION CYLINDER ADJACENT SAID FIRST MENTIONED SCREW STAGE AND HAVING A FIRST TRANSFER VALVE THEREIN, A SECOND CONDUIT IN FLUID COMMUNICATION WITH THE EXTRUSION CYLINDER ADJACENT SAID THIRD MENTIONED SCREW STAGE AND HAVING A SECOND TRANSFER VALVE THEREIN, A PAIR OF CONDUITS IN PARALLEL CONNECTING SAID FIRST TRANSFER VALVE TO SAID SECOND TRANSFER VALVE, A FILTER IN EACH OF SAID PAIR OF CONDUITS IN PARALLEL, SAID TRANSFER VALVES BEING ADJUSTABLE TO SELECT A PATH OF FLOW FOR THE THERMOPLASTIC MATERIAL THROUGH EITHER OF SAID PAIR OF CONDUITS IN PARALLEL.
Claim 2
Dependent Claim
139 words
APPARATUS FOR EXTRUDING AND MIXING THERMOPLASTIC COMPOSITIONS COMPRISING A HEATED EXTRUSION CYLINDER, A MULTI-STAGE EXTRUSION SCREW POSITIONED THEREIN, MEANS FOR ROTATING SAID SCREW, SAID SCREW HAVING A PLASTICIZING AND METERING STAGE, A FLOW RESTRICTION STAGE, A GAS RELEASING STAGE, A PUMPING STAGE, A FIRST CONDUIT IN FLUID COMMUNICATION WITH THE EXTRUSION CYLINDER ADJACENT SAID FIRST MENTIONED SCREW STAGE AND HAVING A FIRST TRANSFER VALVE THEREIN, A SECOND CONDUIT IN FLUID COMMUNICATION WITH THE EXTRUSION CYLINDER ADJACENT SAID THIRD MENTIONED SCREW STAGE AND HAVING A SECOND TRANSFER VALVE THEREIN, A PAIR OF CONDUITS IN PARALLEL CONNECTING SAID FIRST TRANSFER VALVE TO SAID SECOND TRANSFER VALVE, A FILTER IN EACH OF SAID PAIR OF CONDUITS IN PARALLEL, SAID TRANSFER VALVES BEING ADJUSTABLE TO SELECT A PATH OF FLOW FOR THE THERMOPLASTIC MATERIAL THROUGH EITHER OF SAID PAIR OF CONDUITS IN PARALLEL.
References Cited (Backward Citations)
US2183577A
Cited
US2441526A
Cited
US2679320A
Cited
US2836851A
Cited
US3033256A
Cited
US3059276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |