Patent US2578899A successfully refreshed from Google Patents.
US2578899A
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Superstretching polyester structures
Assignee: EIDP Inc
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Filing: 1949-10-22
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Granted: 1951-12-18
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Expires: 1969-10-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Anderson Pace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:35
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D01; D01F; D01F6/00; D01F6/58; D01F6/62; Y; Y10; Y10S; Y10S260/00; Y10S260/23; Y10S264/00; Y10S264/73
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
THE PROCESS WHICH COMPRISES FIRST STRETCHING CONTINUOUS FILAMENTS, OF SUBSTANTIALLY AMORPHOUS SYNTHETIC LINEAR POLYESTER HAVING AN INTRINSIC VISCOSITY OF AT LEAST 0.3 FROM 10 TO 75 TIMES THERE ORIGINAL LENGTH AT A TEMPERATURE IN THE RANGE OF FROM 20* TO 60* C. ABOVE THE APPARENT MINIMUM CRYSTALLIZATION TEMPERATURE FOR SAID POLYESTER AND THEREAFTER DRAWING THE STRETCHED FILAMENTS AT A LOWER TEMPERATURE BETWEEN THE SECOND ORDER TRANSITION TEMPERATURE FOR SAID POLYESTER AND 30* C. ABOVE THE APPARENT MINIMUM CRYSTALLIZATION TEMPERATURE TO IMPART TO SAID FILAMENTS THE DESIRED DEGREE OF MOLECULAR ORIENTATION.
References Cited (Backward Citations)
US2465319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |