Vinylidene dimer process
CA 2015068 C · Owner: Ethyl Corporation · Inventors: Lin, Kaung-Far; Lanier, Carroll W.; Nelson, Gunner E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Vinyl-olefins are converted to vinylidene olefin dimers at a selectivity of at least 85 mole percent by reacting a mixture of dry vinyl-olefin containing 0.001-0.04 moles of trialkyl aluminum per mole of initial vinyl-olefin at a temperature in the range of 100-140°C for a time sufficient to convert at least 80 mole percent of the initial vinyl-olefin to a different material.
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 April 20, 1990 and granted August 17, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 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.