Heat exchanger
CA 2268889 C · Owner: Tsunoda, Tadashi · Inventors: Tsunoda, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat exchanger which is constructed, such that heat exchanger plates (S1 S2) in the, form of a quadrilateral are bent at fold lines in a zigzag manner to form combustion gas passages (4) and air passages (5) alternately in a circumferential direction so as to enhance material yield and to facilitate brazing of components for formation of a fluid duct. Thus radially outward peripheral walls (6, 8o 10o), and radially inward peripheral walls (7 8i, 10i), respectively, are brazed to fold lines at outer peripheries and inner peripheries of the heat exchanger plates (S1, S2) to form a duct (13) continuous to a combustion gas inlet (11) a duct (14) continuous to a combustion gas outlet (12), a …
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 October 17, 1997 and granted April 15, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2019.
- 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.