Composite particles, method for preparing the same and amino resin composition containing the particles
CA 2000472 A1 · Owner: Takenaka, Masaaki · Inventors: Mizushima, Noboru; Takenaka, Masaaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Composite particles comprising talc particles covered with a layer of a condensate of formaldehyde and at least one member selected from the group consisting of aminotriazine type compounds urea and phenols, the talc surface being chemically bonded to the condensate layer. The composite particles can be prepared by a method which comprises reacting formaldehyde with at least one member selected from the group consisting of aminotriazine type compounds urea and phenols in an aqueous medium in the presence of talc particles to form a layer of a condensate on the surface of the talc particles. Amino resin compositions containing the composite particles have mechanical strength comparable to …
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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
- Filed October 11, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 11, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 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
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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.