Process for removing solid asphalt residues produced in the petroleum industry
CA 2282322 A1 · Owner: Breuer, Wolfgang · Inventors: Herold, Claus-Peter; Breuer, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fatty acid esters of general formula (I) R1-COO-(CnH2nO)x-R2 are used to remove solid asphalt residues from the surface of petroleum industry installations or petroliferous formations around petroleum bore holes. In formula (I) R1-COO-(CnH2nO)x-R2, R1 stands for an alkyl radical with 6 to 22 C atoms or for a (CH2)m-COOR4 radical, R2 and R4 independently representing an alkyl radical with 1 to 8 C atoms, n equals 2 or 3 m equals 1 to 6 and x , equals 0 or a number from 1 to 12.
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 February 21, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 21, 2020.
- 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.