Monomeric units useful for reducing the modulus of low water polymeric silicone compositions
CA 2239902 C · Owner: Bausch & Lomb, Incorporated · Inventors: Kunzler, Jay F.; Ozark, Richard M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Monomeric units useful in reducing the modulus of low water polymeric silicone compositions are disclosed. Low water compositions including the subject monomeric units are especially useful in the formation of biomedical articles such as low water silicone contact lenses. In formula (I) A is an activated , unsaturated group; R and D independently are alkyl alkylene or haloalkyl , groups having 1 to 10 carbon atoms wherein said carbon atoms may include ether linkages therebetween; M is hydrogen, fluorine or an alkyl group; R1, R2, R3 , and R4 are independently selected from: alkyl or haloalkyl groups wherein ether linkages may be included between carbon atoms; siloxane groups; and …
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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
- Filed November 12, 1996 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.