Patent US3558267A successfully refreshed from Google Patents.
US3558267A
Expired / Lapsed
US
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Method for dyeing high-temperature-resistant polyamides and polyimides
Assignee: EIDP Inc
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Filing: 1967-08-02
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Granted: 1971-01-26
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Expires: 1987-08-02
Abstract
Abstract FILAMENTS OF AROMATIC POLYAMIDES AND AROMATIC POLYIMIDES THAT STRUCTURALLY WITHSTAND TEMPERATURES OF OVER 150*C. ARE DIFFICULT TO DYE BY CONVENTIONAL TECHNIQUES, BUT ARE READILY DYED AT TEMPERATURES OVER 100*C., PREFERABLY 120 TO 160*C., IN A SOLUTION OF A DYE IN A POLAR ORGANIC SOLVENT THAT CONTAINS OXYGEN IN THE MOLECULE, PREFERABLY N,N-DIALKYLCARBOXYLIC ACID AMIDES SUCH AS N,N-DIMETHYLFORMAMIDE. THE FILAMENTS CAN BE LED THROUGH A NARROW CONDUIT IN WHICH THE DYE SOLUTION IS HELD. THE FILAMENTS CAN BE MIXED WITH OTHER FILAMENTS AND FIBERS THAT ARE NOT MATERIALLY DAMAGED BY THE DYE SOLUTION, AND SUCH MIXTURES SUBJECTED TO THE DYEING TREATMENT.
Inventors
- 👤 Bruno Wilhelm Langenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:56
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/90; D06P1/92; D06P1/928; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/241; D06P3/248; Y; Y10; Y10S; Y10S8/00; Y10S8/92; Y10S8/924
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |