Flame retardant compositions
CA 2013291 C · Owner: Syrier, Johannes L. M. · Inventors: Danforth, Richard L.; Syrier, Johannes L. M.; Smith, Darlene G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Flame-retardant polymer compositions comprising a linear alternating copolymer of carbon monoxide and at least one ethylenically unsaturated compound and a flame-retardant quantity of a substance which is able to generate, upon decomposition, a flame-retarding gaseous compound, characterised in that said substance is a basic or potentially basic reacting metal compound selected from the group of compounds consisting of oxalates and hydroxides, and has an initial decomposition temperature which is at least 25 °C higher than the crystalline melting point of said polymer.
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 March 28, 1990 and granted May 15, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2012.
- 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.