Method for dying aluminum oxide layers
CA 2294642 A1 · Owner: Koerte, Klaus · Inventors: Koerte, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to 1:2-chrome complex dyes of formula (I) wherein R = , C1-9-alkyl or a radical of formula (a) or (b) R1 = C1-4-alkyl, -COOM, -COOR5 , or -CONH2 R2 = hydrogen or SO3M, R3 = hydrogen, methyl or methoxy R4 = , hydrogen, methyl, methoxy or chlorine R5 = C1-4-alkyl, n = 0 to 3, M = , hydrogen or a non-chromophoric cation and Kat+ = hydrogen or a nonchromophoric cation. The inventive dyes are suitable for dying artificially produced oxide layers on aluminium or aluminium alloys to give high light-fast orange-shaded tints.
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 June 11, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 11, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 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.