Production of fine-celled rigid foams based on isocyanate
CA 2246007 A1 · Owner: Biedermann, Anja · Inventors: Heinz, Marion; Rotermund, Udo; Biedermann, Anja
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fine-celled rigid polyurethane foams are produced by reacting polyisocyanates with compounds containing at least two reactive hydrogen atoms in closed molds, wherein a) the reaction components are loaded with gas under pressure before being introduced into the mold, b) the mold is pressurized before during or after introduction, of the reaction mixture c) depressurization takes place in the mold after introduction of the reaction mixture into the mold and before the rigid foam has set.
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 September 25, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 25, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 25, 2020.
- 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.