Method for making corrosion resistant heat exchangers
CA 1294419 C · Owner: Yamaguchi, Noboru · Inventors: Otsuka, Tatsuo; Iwai, Ichiro; Yamaguchi, Noboru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing corrosion resistant heat exchangers having a plurality of aluminum tubular elements and fin members, the method comprising immersing the tubular elements in a bath while passing an electric current so that the surfaces thereof are covered with zinc layers of 0.3µm or more in thickness; combining the zinc plated tubular elements with fin members covered with a brazing sheet so that a core is provisionally formed; painting the provisional core with a non-corrosive flux; and placing the provisional core in a furnace to braze the fin members to the tubular elements, and also to enable the zinc layers to diffuse over the surfaces of the tubular elements.
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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
- Granted January 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 21, 2009.
- 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.