Process for the preparation of lubricating oils
CA 1115228 A · Owner: Shell Canada Limited · Inventors: De Haan, Hubertus N.H.; Breuker, Jacobus H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Lubricating oils having a viscosity index lower than 90 are prepared by catalytic hydrotreatment of aromatic extracts from lubricating oil fractions with the use of fluorinecontaining bimetallic catalysts on alumina as the carrier which catalysts have been prepared according to a closely defined method starting from an alumina hydrogel.
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
- Granted December 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 29, 1998.
- 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.