Chlorine-free diesel engine lubricating composition
CA 2135702 C · Owner: Chevron Chemical Company · Inventors: Smrcka, Nancy K.; Middleton, Wesley A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A railway diesel engine lubricating composition is essentially free of zinc dithiophosphate wear inhibitors and chlorinated inhibitors. This composition has an oil of lubricating viscosity; a noncarbonated sulfurized calcium alkyl phenate a carbonated sulfurized calcium alkyl phenate a calcium Mannich alkyl phenate, and an ethylene carbonate modified polybutene bis-succinimide. The noncarbonated sulfurized calcium alkyl phenate has a sulfur to metal ratio of between 1.1:1 and 2:1 the alkyl group of that phenate has from 8 to 35 carbon atoms and the alkalinity value of that phenate is from 40 to 200 mg. KOH/gram. The noncarbonated sulfurized metal alkyl phenate is prepared by reacting a …
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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 November 14, 1994 and granted August 21, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2016.
- 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.