Disazo navy blue dyes for nylon
CA 1055020 A · Owner: Crompton And Knowles Corporation · Inventors: Feeman, James F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The compounds having the structure: wherein R 13 Cl, -CH3. -C2H5, -OCH3 or -OC2H5; R1 is -H -Cl, -CH3, -C2H5, -OCH3 or -OC2H5; R2 is -H or -CH3; and M ls -H -Na, -X, -Li, or -NH4 are useful a water-soluble acid dyes giving navy blue hues on nylon and other polyamide fibers and have good light fastness and wash fastness and dye nylon fibers over a wide pH range. They are capable of dyeing nylon efficiently at neutral and alakaline pH. They are also useful as dyes for natural polyamides such as silk and wool.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 22, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 22, 1996.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.