Maleic anhydride catalysts and process for their manufacture
CA 2035239 A1 · Owner: Haddad, Muin S. · Inventors: Eryman, William S.; Haddad, Muin S.; Meyers, Bernard L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalyst comprising a phosphorus-vanadium mixed oxide and existing in the form of geometric shapes, such as tablets provides minimum expansion, of the geometric shapes under process reaction conditions since the catalyst, in the form of said geometric shapes has been heated in an inert atmosphere at a temperature within the range of about 343°C (650°F) to about 704°C (1,300°F) prior to being exposed to an oxygen-containing atmosphere at an elevated temperature. This catalyst is suitable for the oxidation of a hydrocarbon, such as benzene or n-butane to maleic anhydride.
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 January 30, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 30, 2013.
- 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.