Sacrificial catalyst for acid treated filter clay
CA 2047102 A1 · Owner: Stevenson, Douglas Johnstone · Inventors: Stevenson, Douglas Johnstone
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sacrificial catalyst - a formulated additive made up of a combination of mineral and metallic salts. This formula when added to most acid treated filter clays used in the used motor oil refining industry, allows the refiner to modify the acid clay motor oil refining process currently practised by elimination of the, acid treatment phase of the process. Raw used motor oil of the detergent type may be treated with catalyzed acid treated clay then heated and filtered in the same manner as is practised on oil that has first been treated with sulfuric acid. The resultant recovered oil will be equal to or better than the best oil recovered by the acid clay process.
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 July 15, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 15, 2013.
- 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.