US3748844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester yarn
Assignee: EIDP Inc
•
Filing: 1971-08-04
•
Granted: 1973-07-31
•
Expires: 1991-08-04
Abstract
Abstract Improved multifilament polyester yarn has good processibility on knitting machines and provides good fabric bulk when used in combination with ordinary polyester yarn. The yarn is an assembly of low-shrinkage, continuous filaments of synthetic linear condensation polyester which are substantially free of crimp. The filaments are drawn and relaxed under conditions which provide a yarn having a sonic velocity value of 1.9 to 3.0 kilometers per second, an X-ray crystallinity value of 16 to 35 percent, and a single shrinkage-tension peak at a temperature below 100*C.
Inventors
- 👤 E Pacofsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:56
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/78; D01F6/84; Y; Y10; Y10S; Y10S57/00; Y10S57/908
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
A yarn as defined in claim 1 wherein said sonic velocity value is between 2.0 and 2.5 kilometers per second.
Claim 2
Dependent Claim
19 words
A yarn as defined in claim 1 wherein said tension peak is at a temperature between 80*C. and 100*C.
Claim 3
Dependent Claim
22 words
A yarn as defined in claim 1 wherein the peak tension at said peak is less than about 0.06 grams per denier.
Claim 4
Dependent Claim
12 words
A yarn as defined in claim 1 composed of ethylene terephthalate polyester.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |