Process to prepare a spindle oil, light machine oil and a medium machine oil
CA 2432034 A1 · Owner: Shell Internationale Research Maatschappij B.V. · Inventors: Geukema, Arjen Peter; Polder, Kevin John Anthony; Van Beijnum, Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process to prepare a spindle oil, light machine oil and a medium machine oil base oil grade by (a) performing a separate catalytic dewaxing on a spindle oil fraction, a light machine oil fraction and a medium machine oil fraction as obtained in a vacuum distillation of a bottoms fraction of a fuels hydrocracking process; (b) performing a separate hydrofinishing of the light and medium machine oil fractions obtained in step (a); (c) separating the low boiling compounds from the spindle oil light machine oil and medium machine , oil fractions as obtained in step (a) and (b) and obtaining the spindle oil light machine oil and medium machine oil base oil grade; (e) wherein the vacuum …
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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 December 18, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 18, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 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
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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.