Patent US5838784A successfully refreshed from Google Patents.
Patent US3268949A successfully refreshed from Google Patents.
US3268949A
Expired / Lapsed
US
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Housing for screw extruders
Assignee: Werner and Pfleiderer GmbH
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Filing: 1965-03-19
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Granted: 1966-08-30
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Expires: 1985-03-19
Abstract
No abstract record available.
Inventors
- 👤 Schmidt Norwin
- 👤 Fritsch Rudolf Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:55
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/082; F04C2/086; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/68; B29C48/6801; B29C48/682; B30; B30B; B30B11/00; B30B11/22; B30B11/224; B29C48/03; F04C2240/00; F04C2240/80; F04C2240/802
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A TWIN SCREW EXTRUDER FOR THERMOPLASTIC MATERIAL, IN COMBINATION, A HOUSING INCLUDING TWO PARALLEL GENERALLY CYLINDRICAL CHAMBERS FOR RECEIVING TWO ROTARY EXTRUSION SCREWS, THE PERIPHERAL OUTLINES OF SAID CHAMBER BEING IN PARTLY INTERSECTING RELATIONSHIP, THE LENGTHWISE EDGE PORTIONS OF THE HOUSING MATERIAL AT THE POINTS OF INTERSECTION OF SAID PERIPHERAL OUTLINES DEFINING A GAP JOINING THE TWO CHAMBERS, A GENERALLY CYLINDRICAL LINER FITTED IN EACH OF SAID CHAMBERS, SAID LINERS HAVING IN THEIR PERIPHERAL WALLS LENGTHWISE EXTENDING CUT-OUTS IN SUBSTANTIAL REGISTRY WITH SAID EDGES OF THE HOUSING MATERIAL, SAID HOUSING FURTHER INCLUDING GROOVES EXTENDING PARALLEL TO SAID CYLINDRICAL CHAMBERS AND BEING EACH DISPOSED BETWEEN SAID EDGE PORTIONS, AND A SADDLE BAR SLIDABLY INSERTED INTO EACH OF SAID GROOVES TO CLOSE SAID CUT-OUTS IN THE LINERS.
Claim 2
Dependent Claim
126 words
IN A TWIN SCREW EXTRUDER FOR THERMOPLASTIC MATERIAL, IN COMBINATION, A HOUSING INCLUDING TWO PARALLEL GENERALLY CYLINDRICAL CHAMBERS FOR RECEIVING TWO ROTARY EXTRUSION SCREWS, THE PERIPHERAL OUTLINES OF SAID CHAMBER BEING IN PARTLY INTERSECTING RELATIONSHIP, THE LENGTHWISE EDGE PORTIONS OF THE HOUSING MATERIAL AT THE POINTS OF INTERSECTION OF SAID PERIPHERAL OUTLINES DEFINING A GAP JOINING THE TWO CHAMBERS, A GENERALLY CYLINDRICAL LINER FITTED IN EACH OF SAID CHAMBERS, SAID LINERS HAVING IN THEIR PERIPHERAL WALLS LENGTHWISE EXTENDING CUT-OUTS IN SUBSTANTIAL REGISTRY WITH SAID EDGES OF THE HOUSING MATERIAL, SAID HOUSING FURTHER INCLUDING GROOVES EXTENDING PARALLEL TO SAID CYLINDRICAL CHAMBERS AND BEING EACH DISPOSED BETWEEN SAID EDGE PORTIONS, AND A SADDLE BAR SLIDABLY INSERTED INTO EACH OF SAID GROOVES TO CLOSE SAID CUT-OUTS IN THE LINERS.
References Cited (Backward Citations)
US2519834A
Cited
US3010151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |