Process for removing contaminants from thermally cracked waste oils
CA 2245025 C · Owner: Her Majesty The Queen In Right Of Canada, As Represented By The Minister Of Natural Resources Canada · Inventors: Ikura, Michio; Stanciulescu, Maria
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is described for removing contaminants from thermally cracked waste oil, e.g. used motor oil. In the process the cracked waste oil is contacted with a solvent comprising methanol. The thermally cracked waste oil is then separated from the solvent whereby a substantial portion of the contaminants are removed into the solvent. Thereafter the solvent is separated from the contaminants and recycled.
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 13, 1998 and granted December 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 13, 2020.
- 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.