Air-drying polyurethane resins, their preparation and use
CA 2035513 A1 · Owner: Walz, Gerd · Inventors: Merten, Gerhard; Schwab, Michael; Walz, Gerd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
139.172, AIR-DRYING POLYURETHANE RESINS THEIR PREPARATION AND USE ABSTRACT OF THE DISCLOSURE, An aqueous coating composition containing at least one waterdispersible polyurethane resin containing air-drying groups and optionally further binder resins and conventional paint additives which polyurethane resin contains structural units derived from (A) polyisocyanates, (B) polyols containing air-drying groups (C) optionally polyols which are free of air drying groups (D) compounds having at least two groups which are reactive with isocyanate groups and at least one group capable of anion formation. (E) optionally monoalcohols containing air-drying groups (F) and / or compounds which differ …
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 February 7, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 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.