Adhesion promoters
CA 2056751 C · Owner: Simon, Hubert · Inventors: Muhlebach, Andreas; Simon, Hubert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of the general formula I, see Formula I in which, R1 is C2-C3alkylene and, R2 is hydrogen C1-C6alkyl which is unsubstituted or substituted by -OH -CN , or, -Si(OR3)3-q(R4)q or is C2-C6alkenyl in which, R3 is C1-C4alkyl or two radicals R3 together are C1-C4alkylene R4 is C1-C4alkyl or phenyl and, q can have values from 0 to 2 furthermore, E is a radical of the formula see Formula II, in which, R5 and R6, independently of one another are hydrogen, C1-C4alkyl, aryl, ethenyl which is substituted by aryl heteroaryl or radicals of the formulae IIa or IIb see Formula IIa, with the proviso that at least one of the radicals R5 or R6 is aryl, ethenyl which is substituted by aryl heteroaryl, …
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 December 2, 1991 and granted June 4, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 2013.
- 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.