Acidic treatment liquid and method of treating copper surfaces
CA 2407532 A1 · Owner: Fuerhaupter, Harry · Inventors: Grieser, Udo; Fuerhaupter, Harry; Hauf, Uwe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a solution and to a method of treating copper surfaces, the copper surfaces being brought into contact with an acidic treatment liquid which contains hydrogen peroxide and at least one fivemembered heterocyclic compound as well as additionally at least one microstructure modifying agent selected form the group comprising thioles A disulfides B, sulfides, C and thioamides D having the respective general formulae wherein R1 and R2 = alkyl, alkenyl aryl, aralkyl, especially benzyl, cycloalkyl and the derivatives thereof and R3 = R1 R1-O, R1-S, amino or , substituted amino wherein R1 and R2 may especially be phenyl or substituted phenyl.
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 6, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 6, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 2023.
- 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.