Degradable polymer mixtures
CA 2019934 A1 · Owner: Hoechst Aktiengesellschaft · Inventors: Payer, Wolfgang; Hobes, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Photodegradable polymer mixtures which comprise a polyolefin prepared by low pressure synthesis; a copolymer containing ethylene, carbon monoxide and if appropriate, further polymerizable components; and small amounts of a carboxylic acid salt of an element of atomic number 22 to 58. The polymer mixture contains 0.5 to 5% by weight of carbon monoxide. The presence of both the copolymer containing carbon monoxide and the carboxylic acid salt improves the degradability of the resultant mixture.
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 June 27, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 2012.
- 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.