Refinery anti-foulant-asphaltene dispersant
CA 2066397 A1 · Owner: Nalco/Exxon Chemicals L.P. · Inventors: Comer, David G.; Mercer, Bradley D.; Stephenson, William K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An asphalt or asphaltene refinery anti-foulant technique comprising the use in crude oil, or crude oil fraction streams of, alkyl-substituted phenol formaldehyde liquid resins in combination with hydrophilic-lipophilic vinylic polymers. The polymeric antifoulant is added to asphalt or asphaltene containing crude oil streams to prevent fouling of metallic or other, i.e. ceramic, surfaces, especially heat transfer surfaces.
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 April 16, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 16, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 16, 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.