US2597557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitric acid treatment of polyethylene terephthalate structures
Assignee: EIDP Inc
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Filing: 1949-05-25
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Granted: 1952-05-20
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Expires: 1969-05-25
Abstract
No abstract record available.
Inventors
- 👤 Amborski Leonard Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:46
CPC Classifications
D; D02; D02J; D02J1/00; D02J1/22; D02J1/228; D02J1/229; D06; D06M; D06M11/00; D06M11/58; D06M11/64; Y; Y10; Y10S; Y10S260/00; Y10S260/23; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A METHOD FOR IMPROVING THE ELONGATION CHARACTERISTICS OF DRAWN, ORIENTED YARNS, FILAMENTS AND FIBERS OF POLYETHYLENE TEREPHTHALATE WHICH COMPRISES CONTACTING SAID STRUCTURES WITH AN AQUEOUS NITRIC ACID SOLUTION AT A TEMPERATURE OF FROM 0* C. TO 95* C. UNTIL STRUCTURES OF THE DESIRED ELONGATION AND TENACITY ARE OBTAINING AND THEREAFTER WASHING SAID STRUCTURES AND DRYING SAME, WHEREBY TO PRODUCE DRAWN STRUCTURES HAVING INCREASED ELONGATION.
Claim 2
Independent Claim
64 words
A METHOD FOR IMPROVING THE ELONGATION CHARACTERISTICS OF DRAWN, ORIENTED YARNS, FILAMENTS AND FIBERS OF POLYETHYLENE TEREPHTHALATE WHICH COMPRISES CONTACTING SAID STRUCTURES WITH AN AQUEOUS NITRIC ACID SOLUTION AT A TEMPERATURE OF FROM 0* C. TO 95* C. UNTIL STRUCTURES OF THE DESIRED ELONGATION AND TENACITY ARE OBTAINING AND THEREAFTER WASHING SAID STRUCTURES AND DRYING SAME, WHEREBY TO PRODUCE DRAWN STRUCTURES HAVING INCREASED ELONGATION.
References Cited (Backward Citations)
US2465319A
Cited
GB610135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |