Gels
CA 2065730 C · Owner: Hudson, John M. · Inventors: Hudson, John M.; Sutherland, Alistair A. P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Gels of hard-elastomer-nard block copolymers with at least 300 parts of extender liquid per 100 pans of the copolymer contain at least 50 parts (per 100 parts of copolymer) of a stabilising additive which resists migration of PVC plasticisers into the gel when in contact with a plasticised PVC article. Styrene-ethylene-butylene)styrene triblock copolymers with organic phosphate stabilisers are preferred, these stabilisers,tending to raise the gel softening temperature.
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 October 2, 1990 and granted January 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 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.