Organosilicon materials
CA 2027697 C · Owner: Bard, John K. · Inventors: Bard, John K.; Burnier, Julia S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A crosslinkable organosilicon prepolymer and a crosslinked organosilicon polymer comprising alternating hydrocarbon and cyclic polysiloxane radicals which is the, hydrosilation reaction product of: (a) at least one polyene having at least two non-aromatic, non-conjugated carbon-carbon double bonds highly reactive in hydrosilation, the carbon-carbon double bonds being either in an alpha, beta or gamma position on a linear carbon moiety, next to two bridgehead positions in a strained polycyclic aliphatic ring structure or in a, cyclobutene ring, other than polycyclic polyenes having two reactive double bonds in a fused ring system; (b) at least one polycyclic polyene having at least two …
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 15, 1990 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 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.