Patent US3771307A successfully refreshed from Google Patents.
US3771307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawing and bulking polyester yarns
Assignee: EIDP Inc
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Filing: 1971-08-24
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Granted: 1973-11-13
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Expires: 1991-08-24
Abstract
Abstract Textured polyester yarn is prepared from multifilament yarn by drawing at a draw ratio of 1.3 to 2.0, and false-twist texturing at temperatures above 200*C. in a continuous process. Preparation of the starting yarn by melt spinning at 3,000 to 3,500 yards per minute is illustrated.
Inventors
- 👤 Dennis George Petrille
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:17
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/0286; D02G1/0206; D02G1/026
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
37 words
The process defined in claim 1 wherein feed yarn having a structural integrity value of about 0.5 to 0.6 is draw-textured at a draw ratio of about 1.5X to 1.7X and a heater temperature above 215* C.
References Cited (Backward Citations)
US3069837A
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US3404525A
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US3474612A
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US3535866A
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US3559391A
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US3601972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |