Method for cleaning aluminum and aluminum alloys
CA 2095809 C · Owner: Henkel Corporation · Inventors: Ono, Yoji; Aoki, Tomoyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aqueous alkaline cleaner for aluminum has a pH in the range from 10.0-12.0 and contains:: At from 0.5 to 10.0 g/L of an alkali builder component; B) from 0.5 to 10.0 g L of aminoalkyl- and or hydroxyalkyldiphosphonic acids and/or their water soluble salts: C) from 0.1 to 3.0 g/L of an aluminum ion sequestering agent component: and D) from 0.5 to 5.0 g/L of a surfactant component. Cleaning aluminum and aluminum alloy with such a cleaner generates an excellent surface condition with respect to de-smutting performance, water wettability avoidance of black smut production. blackening, and paint adherence at least as good as that achieved with conventional acid cleaner. without …
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 November 12, 1991 and granted June 12, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 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.