Silyl derivatives of 2-allyl phenol
CA 2024895 C · Owner: Aristech Chemical Corporation · Inventors: Sivak, Andrew J.; Cullo, Leonard A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Silyl dervatives of 2-allyl phenol, include compositions of the formula (see above formula), where R1, R2 and R3 are independently selected from alkyl and phenyl groups having up to about twelve carbon atoms. They may be made by silylating the corresponding hydroxyl compound. They are useful as comonomers for olefins to introduce functional sites by Ziegler-Natta catalyst systems.
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 September 7, 1990 and granted February 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 7, 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.