Patent US3584103A successfully refreshed from Google Patents.
US3584103A
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US
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Process for melt spinning poly(trimethylene terephthalate) filaments having asymmetric birefringence
Assignee: EIDP Inc
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Filing: 1969-05-01
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Granted: 1971-06-08
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Expires: 1989-05-01
Abstract
Abstract HELICALLY CRIMPED TEXILE FIBERS OF POLY(TRIMETHYLENE TEREPHTHALATE) ARE PRODUCED BY MELT SPINNING FILAMENTS TO HAVE ASYMMETRIC BIREFRINGENCE ACROSS THEIR DIAMETERS, DRAWING THE FILAMENTS TO ORIENT THE MOLECULES THEREOF, ANNEALING THE DRAWN FILAMENTS AT 100 -190*C. WHILE HELD AT CONSTANT LENGTH, AND HEATING THE ANNEALED FILAMENTS IN A RELAXED CONDITION ABOVE 45*C. TO DEVELOP CRIMP.
Inventors
- 👤 Max Emerson Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:47
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/22; D01D5/23; D01F; D01F6/00; D01F6/58; D01F6/62
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |