System for the production of toluene diisocyanate based flexible foams and the flexible foams produced therefrom
CA 2052908 A1 · Owner: Bayer Corporation · Inventors: Milliren, Charles M.; Gricar, James R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mo3525, MD-90-Z23, NOVEL SYSTEM FOR THE PRODUCTION OF TOLUENE DIISOCYANATE BASED FLEXIBLE FOAMS AND THE FLEXIBLE FOAMS PRODUCED THEREFROM, ABSTRACT OF THE DISCLOSURE The present invention is directed to an isocyanate reactive mixture and the flexible polyurethane foam produced therefrom. The reactive mixture contains specific filled polyols, water, a catalyst for the reaction between an isocyanate group and a hydroxyl group, and a specific N-hydroxyalkyl quaternary ammonium salt. The isocyanate used is toluene diisocyanate. Mo3525
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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 7, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 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
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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.