Compositions comprising aminoplast resins and solid colloidal condensation polymers
CA 2048547 C · Owner: Ciba-Geigy Ag · Inventors: Renner, Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Free-flowing powdery compositions comprising A) liquid or semi-solid etherified aminoplast resins and B) solid colloidal condensation polymers of urea or melamine and formaldehyde having a, pore volume greater than 1 cm3/g and a specific surface area greater than 5 m2/g. These compositions can be used, for example as powder coating compositions.
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 August 7, 1991 and granted April 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 2013.
- 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.