Expired Canadian patentCanada
A crosslinkable polyethylene composition
CA 2303552 C · Owner: Keogh, Michael John · Inventors: Keogh, Michael John
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composition comprising: (a) polyethylene; (b) as a first scorch inhibitor a substituted hydroquinone or 4,4'-thiobis(2-t-butyl-5-methyl phenol); (c) as a second scorch inhibitor distearyl disulfide; and (d) an organic peroxide.
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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 30, 2000 and granted November 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 30, 2022.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 30, 2000
GrantedNovember 11, 2003
Term endedMarch 30, 2020
Patent numberCA 2303552 C
Classification (IPC)C08K5/37 +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.