US3669934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved elastomeric fibers
Assignee: Celanese Corp
•
Filing: 1970-03-09
•
Granted: 1972-06-13
•
Expires: 1990-03-09
Abstract
Abstract Improved elastomeric fibers are disclosed and claimed which are comprised of alternating hard and soft segments, i.e., polyesterurethane copolymers, wherein the fibers are improved in properties, particularly permanent set. The fibers of this invention have utility in conventional textile uses.
Inventors
- 👤 Martin Eden Epstein
- 👤 Arnold Joseph Rosenthal
- 👤 Joseph Germano Santangelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:59
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/70
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
stretching said fiber at least about 150 percent of its initial length at below its softening point;
Claim 2
Dependent Claim
17 words
The elastomer fiber of claim 1 wherein said permanent set value is less than about 20 percent.
Claim 3
Dependent Claim
19 words
relaxing the stretched fiber to return it to a length less than the stretched length of the fiber; and,
Claim 4
Dependent Claim
25 words
heating the stretched and relaxed fiber at a constant length at a temperature above about 75* C. and below the softening point of the fiber.
References Cited (Backward Citations)
US2871218A
Cited
US3012987A
Cited
US2962470A
Cited
US3097192A
Cited
US3284539A
Cited
US3357954A
Cited
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 |