Method of improving the shear stability of lithium greases
CA 2001875 C · Owner: Exxon Research And Engineering Company · Inventors: O'Dell Brown, Terrance; Slack, David A.; Alexander, Albert G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The shear stability of a multipurpose grease comprising, (i) a lubricating oil, (ii) a lithium soap of an hydroxy fatty acid (iii) a polyhydric alcohol having at least three hydroxy groups, and, (iv) at least two metal hydrocarbylthiophosphate compounds in which the metal is, different in at least two compounds is enhanced by incorporating at least a major portion of the polyhydric alcohol into the mixture of lubricating oil and lithium soap of an hydroxy fatty acid and before the metal hydrocarbylthiophosphate compounds are added during the grease preparation process. Preferred ingredients are 12-hydroxystearic acid glycerol, antimony dialkyldithiophosphate and zinc , …
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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 October 31, 1989 and granted March 28, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2011.
- 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.