Expired Canadian patentCanada
Improved open celled polyurethane foams and methods and compositions for preparing such foams
CA 2222221 C · Owner: Stepan Company · Inventors: Kaplan, Warren; Neill, Paul
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are methods and compositions for preparing polyurethane foams using emulsified polyol mixture comprising: (a) a polyol formulation comprising a polyester polyol having an OH value of from about 150 to 350; and (b) a cell opening agent.
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 May 24, 1996 and granted February 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 24, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 24, 1996
GrantedFebruary 25, 2003
Term endedMay 24, 2016
Patent numberCA 2222221 C
Classification (IPC)C08J9/06 +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.