Heat pump using co2 as refrigerant and method of operation thereof
CA 2586572 C · Owner: Fujima, Katsumi · Inventors: Fujima, Katsumi; Hamanaka, Kunio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat pump employing CO2 as refrigerant and utilizing heat source of natural water, e.g. well water ground water, river, water or sea water effectively is applied to an air, conditioning system in order to enhance heating/hot water supplying capacity and refrigeration capacity without requiring a large scale appurtenant facilities. A first stopper valve (5) is provided in parallel with a first expansion valve (4) on the downstream side of a compressor a heat, exchanger (6) performing heat exchange with natural water is provided on the downstream side of the first stopper valve (5) and the first expansion valve (4), a second stopper valve (8) is provided in parallel with the second …
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 November 12, 2004 and granted January 8, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 12, 2024.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.