Stabilization of poly (ether ketone ketones)
CA 2023940 C · Owner: Brugel, Edward G. · Inventors: Brugel, Edward G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Poly(ether ketone ketones), which are, important engineering resins are thermally stabilized, by being contacted far at least 15 minutes above their glass transition temperature with an organic hydroperoxide containing at least 0.1 mg of active oxygen per gram, having a boiling point above about 130°C, and degradable between 130°C and the contacting temperature, the hydroperoxide being made from a precursor comprising at least one benzylic or allylic hydrogen in its molecule.
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 August 24, 1990 and granted December 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 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.