Patent US3252182A successfully refreshed from Google Patents.
US3252182A
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Screw press for extrusion of plastics
Assignee: LAVORAZIONE MAT PLAST
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Filing: 1964-01-15
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Granted: 1966-05-24
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Expires: 1984-01-15
Abstract
No abstract record available.
Inventors
- 👤 Colombo Roberto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:20
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/22; B30B11/24; B30B11/243; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/395; B29C48/40; B29C48/402; B29C48/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A SCREW PRESS FOR EXTRUDING PLASTICS COMPRISING A HOUSING, A PAIR OF PARALLEL INTERMESHING SCREWS JOURNALED FOR ROTATION IN SAID HOUSING, EACH SCREWS JOURNALED FOR ROTATION IN SAID HOUSING, EACH SCREW MEMBER COMPRISING TWO SPACED FEED-COMPRESSION SECTIONS HAVING EQUAL DIAMETER CYLINDRICAL CORES AND EQUAL DIAMETER SCREW FLIGHTS HAVING A CLOSE FIT WITH SAID HOUSING AND WITH THE RESPECTIVE INTERMESHED FEED-COMPRESSION SECTIONS OF THE OTHER SCREW MEMBER AND A MIXING SECTION INTERMEDIATE SAID FEEDCOMPRESSION SECTIONS HAVING A CORE OF LARGER DIAMETER THAN SAID CORES AND A SCREW FLIGHT OF SMALLER DIAMETER THAN SAID FLIGHTS SPACED FROM SAID HOUSING.
Claim 2
Dependent Claim
97 words
A SCREW PRESS FOR EXTRUDING PLASTICS COMPRISING A HOUSING, A PAIR OF PARALLEL INTERMESHING SCREWS JOURNALED FOR ROTATION IN SAID HOUSING, EACH SCREWS JOURNALED FOR ROTATION IN SAID HOUSING, EACH SCREW MEMBER COMPRISING TWO SPACED FEED-COMPRESSION SECTIONS HAVING EQUAL DIAMETER CYLINDRICAL CORES AND EQUAL DIAMETER SCREW FLIGHTS HAVING A CLOSE FIT WITH SAID HOUSING AND WITH THE RESPECTIVE INTERMESHED FEED-COMPRESSION SECTIONS OF THE OTHER SCREW MEMBER AND A MIXING SECTION INTERMEDIATE SAID FEEDCOMPRESSION SECTIONS HAVING A CORE OF LARGER DIAMETER THAN SAID CORES AND A SCREW FLIGHT OF SMALLER DIAMETER THAN SAID FLIGHTS SPACED FROM SAID HOUSING.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |