Method for producing maleic acid anhydride
CA 2402420 A1 · Owner: Ruppel, Wilhelm · Inventors: Weiguny, Jens; Ruppel, Wilhelm; Storck, Sebastian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing maleic acid anhydride by heterogeneous catalytic gas phase oxidation of hydrocarbons comprising at least four carbon atoms with gases containing oxygen in the presence of a volatile phosphorus bond on a catalyst containing vanadium, phosphorus and oxygen in a multitube fixed-bed reactor unit consisting of at least two successive cooled reaction areas wherein the temperature of the first reactor area is 350 - 450 ~C and the temperature of the second and other reaction area is 350 - 480 ~C the , difference in temperature between the hottest and coldest reaction area being at least 2 ~C.
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 March 6, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 6, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 6, 2023.
- 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.