Heat exchanger core based on aluminum and process for producing the same
CA 2275569 A1 · Owner: Tanaka, Tsunehiko · Inventors: Tanaka, Tsunehiko; Oki, Yoshito; Suzuki, Toshihiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
By the use of a heat exchanger tube not required for adhesion of Zn in advance and a fin not clad with a brazing composition a heat exchanger core is , provided which has corrosion resistance and brazing capability comparable to or higher than those of the conventional counterpart. Applied onto an outer surface of an extruded flattened tube (4) as a heat exchanger tube is a brazing composition (7) derived from a mixture of silicon and fluorine type flux, and a fin (5) formed of an aluminum-based zinc-containing material is prepared. The extruded flattened tube (4) and the fin (5) are then heated at a given temperature so that the same are brought into brazed relation to each other, …
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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 January 21, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 2020.
- 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.