Patent US3669591A successfully refreshed from Google Patents.
US3669591A
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US
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Apparatus for producing composite fibers
Assignee: SnamProgetti SpA
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Filing: 1970-03-11
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Granted: 1972-06-13
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Expires: 1990-03-11
Abstract
Abstract A SPINNING HEAD FOR MELT SPINNING OF COMPOSITE FILAMENTS COMPRISED OF TWO POLYMERS OF EQUAL SEMI-CIRCULAR CROSS-SECTION IN WHICH THE MATING FACES OF A DISTRIBUTION PLATE AND A SPINNERET PLATE FORM TWO SEPARATE ANNULAR CAVITIES EACH COMMUNICATING WITH A DIFFERENT POLYMER SUPPLY CONTAINED IN THE DISTRIBUTION PLATE. A PLURALITY OF EXTRUSION HOLES IN THE SPINNERET PLATE HAVE THEIR UPPER END PORTIONS OF SEMI-CIRCULAR CROSS-SECTION COMMUNICATION WITH ONE OF THE ANNULAR CAVITIES AND THE REMAINING PORTIONS OF CIRCULAR CROSS-SECTION COMMUNICATING WITH THE OTHER ANNULAR CAVITY.
Inventors
- 👤 Enzo Fermi
- 👤 Francesco Sassanelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:58
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/32; B; B29; B29C; B29C48/00; B29C48/03; B29C48/05; B29C48/16; B29C48/25; B29C48/30; B29C48/345
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |