Colorgalv galvanizing process
CA 2183173 C · Owner: Duncan Galvanizing Corporation · Inventors: Brooks, Richard L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Galvanized steel stock is prepared for the application of a top coating by roughening the surface prior to the application of the top coating. The zinc surface is roughened with the zinc pellets. By using zinc pellets, the treated surface is essentially free of oxidation sites which would later form the basis for corrosion. Both the roughening of the zinc layer of the galvanized steel and the application of the top coating are effected while the zinc coating is still malleable.
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 August 12, 1996 and granted February 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 12, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 12, 2018.
- 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.