Preparation of lithium soap thickened greases
CA 2059234 C · Owner: Shell Canada Limited · Inventors: Harris, John W.; Hall, Robert S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a process for the preparation of a lithium soap thickened grease which comprises heating a mixture of an oil and a lithium base, and optionally also a calcium base to at least, 100°C, thereafter adding a C10-24 saturated or unsaturated fatty acid, and heating the resulting mixture at a temperature in the range 110°C to 200°C until a thickened grease is obtained.
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 13, 1992 and granted December 25, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 13, 2014.
- 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.