Method for the production of a pulverulent composition containing dyestuff and/or pigment
CA 2006350 C · Owner: Ubbink, Marten Theodoor · Inventors: Bes, Richard Francois Theodor; Knol, Jan Dirk; Ubbink, Marten Theodoor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method for the production of a pulverulent composition containing dyestuff and/or pigment composition particles, wherein in a plastic dispersed dyestuff and/or pigment composition particles are formed by mixing an aqueous paste containing dyestuff and/or pigment particles in a plastic emulsion removing water and pulverizing the mass obtained. The dyestuff or pigment is preferably chosen from the spinel pigments, carbon black and organic pigments and trans-, parent iron oxide; the plastic is preferably chosen from polystyrene, polyethene, polyvinyl chloride and polyvinyl acetate. The particles as obtained can be mixed with a molten wax composition, such that the …
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
- Filed December 21, 1989 and granted July 9, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2011.
- 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.