Composition and method of forming a black no-rinse conversion coating on metal surfaces
CA 2125593 A1 · Owner: Betz Laboratories, Inc. · Inventors: Rodzewich, Edward A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A black no-rinse conversion coating on metal surfaces is provided. The treatment of a metal such as aluminum or aluminum alloys with a composition of hexavalent chromium a modified, styrene acrylic resin, a carbon black thickeners surfactants and, coalescents results in a black no-rinse conversion coating. The black coating provides corrosion resistance and is resistant to gasoline, hot oil and ethylene glycol. The coating solution is particularly effective on co-plex shapes having closely spaced parts such as automotive radiators or condensers.
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 10, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 2016.
- 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.