Non-chromated surface preparation materials and methods for corrosion protection of aluminum and its alloys
CA 2218671 C · Owner: Raytheon Company · Inventors: Rosengard, Jordan L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Surface preparation methods (10) and materials that provide corrosion protection for aluminum and its alloys without the use of chromate and that protects aluminum against corrosion nearly as well as a chromate conversion coating. In accordance with the present methods (10) aluminium parts are degreased (11) in a general purpose cleaner and rinsed (12) in hot tap water. The parts are then cleaned (13) using alkaline cleaner and then rinsed (14) in cold tap water. The parts are then deoxidized (15) using one of two alternative steps. The parts may be deoxidized (15a) using a 20-25 volume percent Smut-Go NC solution at room temperature for 15-25 minutes. The parts may alternatively be …
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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 October 21, 1997 and granted April 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 21, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 21, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.