A method of preparing 1,1-dialkoxycycloalkanes
CA 2237073 C · Owner: Colvin, David · Inventors: Subramaniam, Chitoor S.; Colvin, David; John, Thomas V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1,1-Dialkoxycycloalkanes of the structure (see formula II), wherein R1 and R2 are different or the same alkyl moieties and can be a saturated, unsaturated, branched unbranched or cyclic, alkyl moiety of 1 to 3 carbon atoms and n is an integer from 4, to 9, are prepared by reacting with the imino ether hydrochloride more secondary alkanol and a cycloalkanone having to 10 carbon atoms.
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 May 27, 1994 and granted September 25, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2016.
- 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.