US3092891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of monofilaments obtained from highly viscous alpha-olefin polymers
Assignee: Montedison SpA
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Filing: 1959-07-27
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Granted: 1963-06-11
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Expires: 1979-07-27
Abstract
No abstract record available.
Inventors
- 👤 Baratti Enrico
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:00
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/06; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/298
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A PROCESS FOR IMPROVING THE PROPERTIES OF MELTEXTRUDED MONOFILAMENTS CONTAINING POLYPROPYLENE MADE UP PREVAILINGLY OF ISOTACTIC CRYSTALLIZABLE MACROMOLECULES NON-EXTRACTABLE WITH BOILING N-HEPTANE, WHICH COMPRISES THE STEPS OF (1) QUENCHING THE POLYPROPYLENE-CONTAINING MONOFILAMENT IMMEDIATELY AFTER EXTRUSION THEREOF, (2) SUBJECTING THE QUENCHED MONOFILAMENT TO A FIRST STRECHING STAGE AT ROOM TEMPERATURE WITH A STRECHING RATIO OF FROM 3:1 TIO 5:1M (3) SUBJECTING THE STRECHED MONOFILAMENT TO A SECOND STRETCHING STAGE AT ABOUT 100*C. WITH A STRETCHING RATIO OF FROM 1.5 TO 1.9, AND (4) SUBJECTING THE TWICE STRETCHED MONOFILAMENT TO A THIRD STRETCHING STAGE AT ROOM TEMPERATURE WITH A STRETCHING RATIO OF FROM 1.1:1 TO 1.2:1.
Claim 2
Dependent Claim
104 words
A PROCESS FOR IMPROVING THE PROPERTIES OF MELTEXTRUDED MONOFILAMENTS CONTAINING POLYPROPYLENE MADE UP PREVAILINGLY OF ISOTACTIC CRYSTALLIZABLE MACROMOLECULES NON-EXTRACTABLE WITH BOILING N-HEPTANE, WHICH COMPRISES THE STEPS OF (1) QUENCHING THE POLYPROPYLENE-CONTAINING MONOFILAMENT IMMEDIATELY AFTER EXTRUSION THEREOF, (2) SUBJECTING THE QUENCHED MONOFILAMENT TO A FIRST STRECHING STAGE AT ROOM TEMPERATURE WITH A STRECHING RATIO OF FROM 3:1 TIO 5:1M (3) SUBJECTING THE STRECHED MONOFILAMENT TO A SECOND STRETCHING STAGE AT ABOUT 100*C. WITH A STRETCHING RATIO OF FROM 1.5 TO 1.9, AND (4) SUBJECTING THE TWICE STRETCHED MONOFILAMENT TO A THIRD STRETCHING STAGE AT ROOM TEMPERATURE WITH A STRETCHING RATIO OF FROM 1.1:1 TO 1.2:1.
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) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |