Method of removing soot from lubricating oils
CA 2024005 A1 · Owner: Exxon Research And Engineering Company · Inventors: Brownawell, Darrell W.; Brownawell, Darrell W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Soot can be effectively removed from a lubricating oil used in a non-gasoline fueled internal combustion engine by contacting the oil with a heterogenous strong base. This results in improved engine cleanliness and reduced engine wear.
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 August 24, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2012.
- 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.