Expired Canadian patentCanada
Clarifiers for polyolefins and polyolefin compositions containing same
CA 2037576 C · Owner: Titus, George R. · Inventors: Millner, O. Ellmo; Clarke, Richard P.; Titus, George R.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Dibenzylidene xylonates are a new class of clarifiers for polyolefins. the invention includes polyolefin compositions having the new clarifiers therein.
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 5, 1991 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2013.
- 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 5, 1991
GrantedNovember 23, 1999
Term endedMarch 5, 2011
Patent numberCA 2037576 C
Classification (IPC)C07D493/04 +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.