US2952879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing spontaneously extensible structures
Assignee: EIDP Inc
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Filing: 1958-02-28
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Granted: 1960-09-20
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Expires: 1978-02-28
Abstract
No abstract record available.
Inventors
- 👤 Robert E Kitson
- 👤 Cecil E Reese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:26
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; Y; Y10; Y10S; Y10S260/00; Y10S260/23; Y10S264/00; Y10S264/71; Y10S264/73; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
THE PROCESS OF PREPARING STRUCTURES CAPABLE OF SPONTANEOUSLY AND IRREVERSIBLY EXTENDING IN LENGTH ON HEATING AT ABOVE ABOUT 90*C. WHICH COMPRISES PASSING A LINEAR TEREPHTHALATE POLYESTER STRUCTURE HAVING A CRYSTALLINITY OF LESS THAN ABOUT 35%, SAID STRUCTURE HAVING A LONGITUDINAL AXIS AND BEING ORIENTED ALONG THE SAID AXIS, THROUGH A ZONE MAINTAINED AT A TEMPERATURE OF AT LEAST 90*C. FOR A TIME SUFFICIENT TO SHRINK THE STRUCTURE ALONG ITS AXIS BETWEEN ABOUT 20% AND 70% AND THEREAFTER COOLING THE SAID STRUCTURE BEFORE ITS CRYSTALLINITY REACHES THE MAXIMUM LEVEL ACHIEVABLE IN THE SAID ZONE.
Claim 2
Dependent Claim
93 words
THE PROCESS OF PREPARING STRUCTURES CAPABLE OF SPONTANEOUSLY AND IRREVERSIBLY EXTENDING IN LENGTH ON HEATING AT ABOVE ABOUT 90*C. WHICH COMPRISES PASSING A LINEAR TEREPHTHALATE POLYESTER STRUCTURE HAVING A CRYSTALLINITY OF LESS THAN ABOUT 35%, SAID STRUCTURE HAVING A LONGITUDINAL AXIS AND BEING ORIENTED ALONG THE SAID AXIS, THROUGH A ZONE MAINTAINED AT A TEMPERATURE OF AT LEAST 90*C. FOR A TIME SUFFICIENT TO SHRINK THE STRUCTURE ALONG ITS AXIS BETWEEN ABOUT 20% AND 70% AND THEREAFTER COOLING THE SAID STRUCTURE BEFORE ITS CRYSTALLINITY REACHES THE MAXIMUM LEVEL ACHIEVABLE IN THE SAID ZONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-20 | 1964-03-21 | 1964-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-20 | 1968-03-21 | 1968-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-20 | 1972-03-21 | 1972-09-20 | $7700.00 | Window Closed / Lapsed |