Heat exchanger
CA 2279862 C · Owner: Wakayama, Tokiyuki · Inventors: Shikano, Fumihiko; Wakayama, Tokiyuki; Tsunoda, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ends of heat transfer plates (S1, S2), is formed by bending foldable materials in a zigzag shape along bend lines (L1 L2), are cut in an inverted V-shape, and flange sections (26) formed by bending vertex parts of the inverted Vshape portions are superposed one over another and brazed in a planar contact state, thereby to form combustion gas passage inlets (11) and air passage outlets (16) along the two sides of the V-shape portions. Compared with brazing of separate flange members onto the cut faces of the vertex parts of the V-shape portions, this fabrication not only dispenses with precise finishing of the cut faces, but also serves to increase the brazing strength.
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 January 23, 1998 and granted October 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 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.