Process for sealing anodized aluminum
CA 1338442 C · Owner: Brodalla, Dieter · Inventors: Wuest, Willi; Brodalla, Dieter; Kirchhoff, Winfried
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the process of sealing decorative anodized aluminum oxide coatings in hot aqueous solutions superior results are obtained when the sealing solutions contain 1-phosphonopropane-1,2,3-tricarboxylic acid 1,1-diphosphonopropane-2,3-dicarboxylic acid and/or, alkali metal and/or alkanolamine salts of these acids. The presence of these acids or their salts prevents the formation of bloom and allows shorter sealing times with equivalent quality, and the addition of as little as 1 ppm of aluminum ions to such solutions also prevents iridescence.
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
- Granted July 9, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 9, 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.