Diethyl ester derivatives of polyalkyl 1,4-dioxa-8-azaspiro¬4,5 -decane-2,3-dicarboxylic acid light stabilizers for plastics
CA 1287054 C · Owner: Nelson, Richard Victor · Inventors: Stephen, John Fergus; Nelson, Richard Victor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Monomeric and oligomeric derivatives of the diethyl ester of polyalkyl 1,4-dioxa-8-azaspiro-4.5decane-2,3-dicarboxylic acid are useful light stabilizers for synthetic polymer resins such as polyolefins, and in particular, polypropylene.
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
- 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.
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.