Water-thinnable etherified melamine-formaldehyde resins
CA 2390324 A1 · Owner: Wonner, Johann · Inventors: Schloettig, Karin; Woelfert, Guenter; Scholl, Frank
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Water-dilutable etherified melamine-formaldehyde resins obtained by reacting melamine, formaldehyde a compound, having anionic groups and an etherification alcohol in a mixing ratio of melamine:formaldehyde:compound having anionic group:etherification alcohol of 1:(1.7 to 7.0):(0.01 to 0.4):(10 to 30) in the reaction mixture are prepared in a multistage process and are used for preparing impregnates, especially glass fibre fleece and in paper coating.
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 June 11, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 11, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 2024.
- 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.