Sulfonated lignin dispersants and dyestuffs and methods utlizing the same
CA 1185238 A · Owner: Reed Lignin Inc. · Inventors: Lin, Stephen Y.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Dispersants especially well suited for use with insoluble dyes are, produced by reacting hydroxyl benzyl alcohol compounds with sulfonated lignin derivatives. The dispersants have high levels of heat stability coupled with, desirable dye reduction, staining foaming, milling and viscosity-reducing properties. Dyestuff, dye pastes and dye baths as well as methods utilizing, them, are provided.
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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 April 9, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 9, 2002.
- 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.