Patent US3632719A successfully refreshed from Google Patents.
US3632719A
Expired / Lapsed
US
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Process and apparatus for melt-spinning of polyamide
Assignee: Teijin Ltd
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Filing: 1970-03-09
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Granted: 1972-01-04
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Expires: 1990-03-09
Abstract
Abstract LOW MOLECULAR MATERIAL SUCH AS MONOMERS AND OLIGOMERS ARE REMOVED FROM THE VICINITY OF A SPINNERET POSITIONED WITHIN AN IMPROVED CHAMBER FOR EXTRUSION OF FILAMENTS BY WITHDRAWING A SMALLER AMOUNT OF AIR FROM NEAR THE FACE OF THE SPINNERET TO ACHIEVE REMOVAL OF LOW MOLECULAR SUBSTANCES IN LARGE QUANTITY, PROVIDED A QUIESCENT AREA IN THE VICINITY OF THE SPINNERET SURFACE, AND MAINTAIN THE ATMOSPHERE IN THE VICINITY OF THE SPINNERET SURFACE AT AN ELEVATED TEMPERATURE.
Inventors
- 👤 Tetsuo Nozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:46
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/08
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |