Canadian application, no grantCanada
Use of silicone polyether copolymers in the production of high-resilience polyurethane foams
CA 2264237 A1 · Owner: Weier, Andreas · Inventors: Klietsch, Bernd-Jurgen; Langenhagen, Rolf-Dieter; Burkhart, Georg
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the use of silicone-polyether copolymers of the formula I, (see fig. I) as surface-active substances in the production of HR polyurethane foams.
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 26, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 26, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 2021.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 26, 1999
GrantedNo grant recorded
Term endedFebruary 26, 2019
Patent numberCA 2264237 A1
Classification (IPC)C08J9/00 +2 more
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.