Expired Canadian patentCanada
Polyalkyl piperidin-4-yl substituted tartrate-derived acetal ester and amide light stabilizers for plastics
CA 1287053 C · Owner: Stephen, John Fergus · Inventors: Nelson, Richard Victor; Stephen, John Fergus
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Tartrate-derived acetal esters and amides possessing the polyalkyl piperidin-4-yl moiety are useful light stabilizers with synthetic polymer resins such as polyolefins and, in particular polypropylene.
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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
- Granted July 30, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 30, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledOctober 10, 1986
GrantedJuly 30, 1991
Term endedJuly 30, 2008
Patent numberCA 1287053 C
Classification (IPC)C07D405/14 +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.