A process for removing essentially naphthenic acids from a hydrocarbon oil
CA 2198623 C · Owner: Grande, Knut · Inventors: Grande, Knut; Sorlie, Carsten
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for removing essentially naphthenic acids from a crude oil which has not previously been fractionated by distillation or from which only a naphtha , fraction has been distilled. The crude oil is hydrogenated at 1-50 bars and 100-300 ·C over a catalyst of the kind used for hydrogenation of atmopsheric residue oils. As a catalyst, especially Ni-Mo or Ni-Co deposited on alumina as a carrier material is used.
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 August 29, 1995 and granted October 24, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 29, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 29, 2017.
- 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.