Energetic copolyurethane thermoplastic elastomer
CA 2214729 C · Owner: Desilets, Sylvain · Inventors: Marois, Andre; Ampleman, Guy; Desilets, Sylvain
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
An energetic copolyurethane thermoplastic elastomer is prepared by polymerizing a dihydroxyl, terminated telechelic energetic polymer having a functionality of two or less with a diisocyanate, at a NCO/OH ratio of about 0.7 to 1.2. The resulting copolymer is easy to incorporate in gun, propellant formulations and is recyclable.
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.
Why it's free to use
- Filed September 8, 1997 and granted May 13, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 8, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 8, 2019.
- 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.