Patent US2786732A successfully refreshed from Google Patents.
US2786732A
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Process for raising the melting point of poly-e-caprolactam filaments, threads, and yarns by treatment with gaseous formaldehyde and products produced thereby
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1953-03-03
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Granted: 1957-03-26
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Expires: 1973-03-03
Abstract
No abstract record available.
Inventors
- 👤 Gabler Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:19
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/127; C08J2377/00; Y; Y10; Y10S; Y10S8/00; Y10S8/21
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
54 words
POLY-E-CAPROLACTAM SYNTHETIC LINEAR POLYAMIDE FILAMENTS THREADS, AND YARNS, PRODUCED BY SUBJECTING SAID FILAMENTS, THREADS AND YARNS TO A COLD-DRAWING PROCESS, WHEREBY THEY ARE EXTENDED TO FROM 350%-400% OF THEIR ORIGINAL LENGHT, THEN DRYING THE SAME TO FREE THEM COMPLETELY FROM WATER, AND THEREAFTER REACTING THEM WITH DRY GASEOUS FORMALDEHYDE, AT A TEMPERATURE RANGING FROM
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) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |