Heat exchangers
CA 2050281 C · Owner: National Engineering And Assessment Group Limited · Inventors: Hesselgreaves, John Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat exchanger includes a plurality of fluid pathways (13 15, 16, 17, 18) , in which at least some are defined between surfaces of unperforated primary plates (10). Between the primary plates (10) are at least two secondary perforated (with perforations (11)) plates (12), extending along the fluid pathway (13 15, 16, 17, 18) with the perforations (11) in adjacent plates (12) be ing staggered. Adjacent secondary (12) and primary (10) sheets are in contact such that conducting pathways (19) are formed extending between the two primary surfaces whilst areas of secondary plates (12) not in contact with other secondary plates (12) institute secondary surfaces (22).
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 May 2, 1990 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 2, 2012.
- 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.