US3706525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water swollen cellulose dyeing with high molecular weight disperse dye in a glycol ether solution
Assignee: EIDP Inc
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Filing: 1971-03-08
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Granted: 1972-12-19
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Expires: 1991-03-08
Abstract
Abstract A PROCESS FOR DYEING WATER SWELLABLE CELLULOSIC MATERIALS, OR MIXTURE OR BLENDS THEREOF WITH SYNTHETIC MATERIALS, WHICH PROCESS COMPRISES CONTACTING SAID CELLULOSIC MATERIAL IN ANY SEQUENCE WITH WATER IN SUFFICIENT AMOUNT TO SWELL THE CELLULOSE, A PREFORMED DYE OF LOW WATER SOLUBILITY, AND A DYE SOLVENT WHICH IS AN ETHYLENE GLYCOL OR A POLYETHYLENE GLYCOL, E.G. DIETHYLENE GLYCOL MONOMETHYL ETHER, IS A LEAST PARTLY MISCIBLE WITH WATER, AND BOILS ABOVE ABOUT 150*C. AT ATMOSPHERIC PRESSURE, PROVIDED THAT AT SOME STAGE DURING THE PROCESS THE INTERIOR OF THE SWOLLEN CELLULOSE IS CONTACTED WITH A SOLUTION OF THE DYE IN AQUEOUS DYE SOLVENT OF DYE SOLVENT.
Inventors
- 👤 John Blackwell
- 👤 William Henry Gumprecht
- 👤 Roy Emerson Starn Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:16
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/60; D06P1/90; D06P1/92; D06P1/928; D06P3/00; D06P3/02; D06P3/04; D06P3/24; D06P3/26; D06P3/34; D06P3/52; D06P3/54; D06P3/58; D06P3/60; D06P3/6033; D06P3/82; D06P3/8204; D06P3/8219; D06P3/8223; D06P3/8228; D06P3/8233; Y; Y10; Y10S; Y10S8/00; Y10S8/907; Y10S8/908; Y10S8/92; Y10S8/922
Claims Analysis
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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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |