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US2516562A
Expired / Lapsed
US
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Process of making artificial wool from nylon fibers
Assignee: EIDP Inc
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Filing: 1946-12-03
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Granted: 1950-07-25
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Expires: 1966-12-03
Abstract
No abstract record available.
Inventors
- 👤 Graham Boynton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:12
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/127; Y; Y10; Y10S; Y10S264/00; Y10S264/56; Y10S8/00; Y10S8/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS FOR OBTAINING IMPROVED NYLON FILAMENTS HAVING A WOOL-LIKE CRIMP, SAID PROCESS COMPRISING HEATING WITH INERT DRY HEAT IN RELAXED CONDITION TO A TEMPERATURE OF FROM 10*C. TO 50*C. BELOW ITS MELTING POINT, AN ORIENTED NYLON FILAMENT WHICH HAS BEEN SUBJECTED TO TREATMENT WITH FORMALDEHYDE RENDERING IT INSOLUBLE IN META CRESOL, AND CONTINUING SAID HEATING UNTIL THE FILAMENT HAS SHRUNK AT LEAST 50% OF ITS ORIGINAL LENGTH, SAID NYLON FILAMENT AFTER SAID TREATMENT WITH FORMALDEHYDE CONTAINING AT LEAST 0.25% COMBINED FORMALDEHYDE, AND PRIOR TO SAID TREATMENT BEING INSOLUBLE IN WATER, SOLUBLE IN META CRESOL, AND HAVING A MELTING POINT ABOUT 200*C.
Claim 2
Dependent Claim
102 words
A PROCESS FOR OBTAINING IMPROVED NYLON FILAMENTS HAVING A WOOL-LIKE CRIMP, SAID PROCESS COMPRISING HEATING WITH INERT DRY HEAT IN RELAXED CONDITION TO A TEMPERATURE OF FROM 10*C. TO 50*C. BELOW ITS MELTING POINT, AN ORIENTED NYLON FILAMENT WHICH HAS BEEN SUBJECTED TO TREATMENT WITH FORMALDEHYDE RENDERING IT INSOLUBLE IN META CRESOL, AND CONTINUING SAID HEATING UNTIL THE FILAMENT HAS SHRUNK AT LEAST 50% OF ITS ORIGINAL LENGTH, SAID NYLON FILAMENT AFTER SAID TREATMENT WITH FORMALDEHYDE CONTAINING AT LEAST 0.25% COMBINED FORMALDEHYDE, AND PRIOR TO SAID TREATMENT BEING INSOLUBLE IN WATER, SOLUBLE IN META CRESOL, AND HAVING A MELTING POINT ABOUT 200*C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-24 | 1954-01-23 | 1954-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-24 | 1958-01-23 | 1958-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-24 | 1962-01-23 | 1962-07-25 | $7700.00 | Window Closed / Lapsed |