US2947598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Producing shaped articles comprising isotactic polypropylene
Assignee: Individual
•
Filing: 1957-08-30
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Granted: 1960-08-02
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Expires: 1977-08-30
Abstract
No abstract record available.
Inventors
- 👤 Maragliano Domenico
- 👤 Denti Franco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:12
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/04; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/06; D01F6/44; D01F6/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PROCESS FOR PRODUCING, BY MELT-EXTRUSION METHODS, SHAPED ARTICLES OF PROPYLENE POLYMERS CONSISTING PREVAILINGLY OF ISOTACTIC POLYPROPYLENE AND IN WHICH THE PROPYLENE POLYMER IS MELT-EXTRUDED AT AN INTRINSIC VISCOSITY BETWEEN 0.3 AND 2.0, WHICH PROCESS COMPRISES HEATING ISOTACTIC POLYPROPYLENE HAVING MIXED THEREWITH UP TO 15% OF ATACTIC POLYPROPYLENE AT A TEMPERATURE FROM 20*C. TO 150*C. ABOVE THE MELTING POINT OF THE ISOTACTIC POLYPROPYLENE TO OBTAIN A HOMOGENIZED MOLTEN MASS OF THE POLYMER HAVING AN INTRINSIC VISCOSITY BETWEEN 0.3 AND 2.0, FILTERING THE MOLTEN MASS AT SAID TEMPERATURE ABOVE THE MELTING POINT OF THE ISOTACTIC POLYPROPYLENE, THEN COOLING THE MASS OF A TEMPERATURE BETWEEN THE MELTING POINT OF THE ISOTACTIC POLYMER AND ABOUT 60*C. ABOVE THE MELTING POINT THEREOF, FILTERING THE COOLED MASS AT THE TEMPERATURE OF COOLING AND IMMEDIATELY EXTRUDING THE MASS, AT THE TEMPERATURE OF COOLING, UNDER PRESSURE THROUGH A SHAPING DEVICE.
Claim 2
Dependent Claim
143 words
A PROCESS FOR PRODUCING, BY MELT-EXTRUSION METHODS, SHAPED ARTICLES OF PROPYLENE POLYMERS CONSISTING PREVAILINGLY OF ISOTACTIC POLYPROPYLENE AND IN WHICH THE PROPYLENE POLYMER IS MELT-EXTRUDED AT AN INTRINSIC VISCOSITY BETWEEN 0.3 AND 2.0, WHICH PROCESS COMPRISES HEATING ISOTACTIC POLYPROPYLENE HAVING MIXED THEREWITH UP TO 15% OF ATACTIC POLYPROPYLENE AT A TEMPERATURE FROM 20*C. TO 150*C. ABOVE THE MELTING POINT OF THE ISOTACTIC POLYPROPYLENE TO OBTAIN A HOMOGENIZED MOLTEN MASS OF THE POLYMER HAVING AN INTRINSIC VISCOSITY BETWEEN 0.3 AND 2.0, FILTERING THE MOLTEN MASS AT SAID TEMPERATURE ABOVE THE MELTING POINT OF THE ISOTACTIC POLYPROPYLENE, THEN COOLING THE MASS OF A TEMPERATURE BETWEEN THE MELTING POINT OF THE ISOTACTIC POLYMER AND ABOUT 60*C. ABOVE THE MELTING POINT THEREOF, FILTERING THE COOLED MASS AT THE TEMPERATURE OF COOLING AND IMMEDIATELY EXTRUDING THE MASS, AT THE TEMPERATURE OF COOLING, UNDER PRESSURE THROUGH A SHAPING DEVICE.
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) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |