Process for the preparation of vinyl acetate
CA 2018991 C · Owner: Wirtz, Peter · Inventors: Eichler, Klaus; Wunder, Friedrich; Roscher, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process fox the preparation of vinyl acetate in the gas phase from ethylene acetic acid, and oxygen and/or oxygen-containing gases on a catalyst of palladium and/or compounds thereof, and optionally. in additions gold and/or gold compounds and, as, activators, alkali metal compounds and optionally in addition, cadmium compounds on a support. The support comprises SiO2 or an SiO2-Al2O3 mixture having a surface area of 50-250 m2/g and a pore volume of 0.4-1.2 ml/g and, has a grain size of from 4 to 9 mm. 5 to 20% of the pore volume of the support is farmed by pores having radii of from 200 to 3,000 angstrom and 50 to 90% of the pore volume is formed by pores having …
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 June 14, 1990 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 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.