US3787182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the dyeing of tow in hydrated condition
Assignee: Novartis AG
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Filing: 1972-10-31
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Granted: 1974-01-22
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Expires: 1992-10-31
Abstract
Abstract A process for the continual dyeing of fibres produced by a wet spinning process, in particular for the continual dyeing of polyacrylonitril tow in a hydrated condition is disclosed in that the fibre or the fibre strand after fibre formation without previous drying is passend through a dyestuff solution or suspension which is flowing in counter current. Said process is very economical and provides without the use of any electronic controls the continual dyeing of said fibres with almost 100 percent exhaustion.
Inventors
- 👤 G Eigenmann
- 👤 L Kaiser
- 👤 O Nothiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:34
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/70; D06P3/76; D06L; D06L4/00; D06L4/60; D06L4/614; D06P3/702; D06P3/72; D06P3/74; Y; Y10; Y10S; Y10S8/00; Y10S8/932
Claims Analysis
Total Claims: 0
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |